The "Jewish calendar" (or the "Hebrew calendar") used in Israel today is NOT the calendar of God described in the Bible (in the Old Testament, also called "Tanakh" in Hebrew). There are very big differences, which are not known by many Christians and even many Jews. The Israelites themselves have no interest in pointing out the differences, because otherwise they would have to admit that they are acting against God's instruction and miscalculating their feast days. Unfortunately, many Christian churches (Evangelicals, Seventh-day Adventists, the splinter groups of the Church of God...) also equate the Jewish calendar with God's biblical calendar. This is a big mistake, because in this way they calculate the biblical feast days incorrectly in many years; these are then Jewish feasts, but not the biblical feasts of God.

God created the living space and time. He alone has the right to determine the times of assembly (feast days). God's clearly defined astronomical specifications (sun, moon, stars) determine the days, months, years and also all biblical feasts. Human calculations and traditions have no meaning for God, on the contrary, they show rebellion against the Creator. God's Luni-Solar calendar is sensational because it combines the heavenly bodies (sun, moon, stars), nature (phenology), harvest seasons and time into a perfect harmonious unity. However, the Jewish calendar has too many errors and deviates from God's timeline by several weeks in some years because leap years are miscalculated. The following are the most important facts and differences that no one can deny:

• The creators of the calendars: As the earth and the entire universe belong to God, only He has the right to create a calendar for His creation. He gave the sun, the moon and the stars their course and thus precisely determined the calendar. In contrast, the Jewish calendar was invented by people (rabbis) who do not pay attention to God's astronomical principles.
• The Messiah: The biblical calendar was made by God, more precisely by the God Yahweh (YHWH). It is no secret that the God Yahweh corresponds to the later Jesus Christ, the Word of God. Many Christians know this and it is even publicly and unequivocally proven on Wikipedia under the keyword "pre-existence of Christ". This is not insider knowledge, because the Bible is extremely clear on this point, so that this fact is known to most churches (Jn 1:1-5; 1Cor 8:6; 1Cor 10:4; Heb 1:2; Col 1:15-20; Mi 5:1,3 cf. Mt 2:5-6; Jn 8:58; Prov 8:22-25; Rev 19,13 cf. Jn 1:14).
  Jesus Christ (the Word of God) himself is therefore the author and creator of the biblical calendar. He alone has the copyright. In contrast, the Jewish calendar was developed by people of a nation that (with a few exceptions) rejects Jesus Christ as the Messiah and wants a different Messiah instead.
• Time of origin and naming: God's calendar and the calculation of time already came into being at the creation of the earth, when the sun, moon and stars (and their respective orbits) were created. God gave us a calendar, not the Jews, because they have their own calendar, since they no longer want God's calendar. God's calendar already existed when there were no humans. But the Jewish calendar dates back to the 4th century AD and was completely unknown until then. God's calendar described in the Tanakh (Leviticus 23) is based on the words God gave to the people of Israel through Moses during the Exodus from Egypt. However, today's Hebrew calendar is not based on the words of God, but on the calculations of the Jewish patriarch Hillel II (Wikipedia), who was active from around 350 to 365 AD under Emperor Julian (*331; †363; Wikipedia) and (according to a tradition from Hai Gaon in 358) created the constant Jewish calendar based on solar years, which is still valid today. His calendar was invented in 358/359, was intended to be permanent and is still valid in Israel today. 
  This calendar was invented by rabbis who reject our Lord Jesus Christ as the Messiah. Hillel used the Babylonian 19-year cycle with some modifications necessary for Jewish ritual. The beginning of the Jewish calendar was taken to be 3761 BC as the supposed year of creation, which was demonstrably miscalculated because several centuries were missing. The Jewish calendar therefore begins in the wrong year and every year begins in the wrong month (in fall instead of spring). It is in many ways not the calendar that Moses had, and it is also not the calendar that was used in Israel at the time of Jesus.
  The Jewish calendar is not based on the exact astronomical specifications of God (sun, moon, stars), but is primarily based on Jewish traditions, whereby pagan (Roman and Catholic) considerations were also incorporated and greater importance was attached to the sun. This is why it is called the "Jewish calendar", but NOT the "calendar of God" and NOT the "biblical calendar". Again, the calendar of God mentioned in the Bible is not identical to the Jewish calendar and only in a few years (e.g. 2020 or 2023) do the feast days of God fall on the same days in both calendars. Sometimes (such as 2024) there is a whole month in between. This is why the two calendars are named differently. 
• Biblical or unbiblical: God's calendar is based on the Bible (especially Leviticus 23), but the Jewish calendar is an unbiblical calendar. The calendar mentioned in the Bible comes from God, but the Jewish calendar is an invention of man. Although attempts are made to approximate God's calendar with mathematical models, this is not successful in many years. The Jewish calendar therefore contradicts the Holy Scriptures.
• Basis and accuracy: God's calendar is based on astronomical conditions and is therefore extremely accurate, whereas the Jewish calendar is only based on statistical averages and is very inaccurate, especially as in incorrectly calculated leap years the spring and fall festivals can fall a whole month after the equinox (i.e. out of season).
• Calendar of a free and an enslaved people: The calendar described in the Tanakh (Old Testament) is the calendar of a liberated people that God led out of Egypt. Today's Jewish calendar, however, was invented by a disobedient and therefore captive and enslaved people who were driven out of Israel. As a result, the Jews, who were scattered across all the continents of the earth, could no longer see the first crescent moon (the new light) over Jerusalem. The prophetic books often tell how the people of Israel turned away from God, so that God had them punished several times on the on the day of mourning, the 9th of Av (the national day of disaster) when the First (587/586 BC) and the Second Temple (70 AD) were destroyed. Due to the crucifixion, the rejection of Jesus as the Messiah and the persecution of the first followers of Jesus (the first Christians), God withdrew His protective hand over Israel in 70 AD, when the Romans conquered Jerusalem and drove almost all of its inhabitants from their homeland and into worldwide slavery.

• The biblical calendar is a luni-solar calendar, but the Jewish calendar is NOT a luni-solar calendar, but a mathematical calendar with several Babylonian calculation methods. While many Jews and Christians claim that the Jewish calendar is supposedly a luni-solar calendar, this is FALSE because this calendar is not based on the actual astronomical parameters and the first crescent moon (the new light) over Israel, but only ASSUMES them based on statistical averages. Therefore, the Jewish month often does not begin on the day of the first crescent moon (the new light), but either one or more days before or after it. The Islamic calendar is a lunar calendar (hence the feast days shift through all the seasons) and the Catholic calendar is a solar calendar, but only God's biblical calendar is a true astronomical lunar-solar calendar. The modern Jewish calendar, on the other hand, is just a bad copy with numerous errors, which is also dramatically demonstrated by the calculation of the wrong leap years (such as 2024). 

• Different feasts and assembly times: All biblical feast days are assemblies (moedim, appointed times) with God, and those who miscalculate and come too early or too late on these appointed days are celebrating with themselves, but not with the God of the Bible. Therefore, the Jews do not celebrate many feast days with God, but without God, because the true feasts appointed by God are either before or after them. In some years there are exceptions (e.g. 2020 or 2023) when God's calendar and the Jewish calendar fall on the same days at Passover.
  Many Christians also ignore a very important fact, namely that Jesus Christ (the Word of God, Yahweh of the Old Testament) himself is the author of the biblical calendar. He therefore established all 7 feasts of God. They are days of assembly with YHWH/Jesus. Christians who celebrate the 7 feasts according to the Jewish calendar (such as the many splinter groups of the Church of God) only celebrate with the Jews, but not with God (the Father) and Jesus, because they were present on other days. In 2024 in particular, the Church of God celebrated all 7 biblical feasts at the wrong time, even a whole month late, because the Jewish calendar determined the leap year incorrectly. 
  The Jewish calendar was structured in such a way that certain annual Sabbaths (High Sabbaths, festivals) cannot fall on certain days of the week. God's biblical calendar does not recognize these human regulations, but the beginning of the month is aligned solely with the first visible crescent moon (the new light). This means that the 7 biblical feast days are clearly and without dispute fixed and can fall on different days of the week from year to year, without certain restrictions being able to shift the beginning of the month forwards or backwards. In the Jewish calendar, however, Pentecost is celebrated on a fixed date, because the 50th day always falls on the 6th of Siwan (6th day of the 3rd month), whereas Pentecost falls on different days in God's calendar, namely on the 5th, 6th or 7th of Siwan (see TorahCalendar and Omer). This is also confirmed by literature (Talmud) from the first century before and after Christ. This is why the counting of the "50th day" is necessary, otherwise God would have spoken of the "6th Sivan", which He did not do.
• Assembly times and the attitude towards them: Many Christians say, “Even if I celebrate the feast days with the Jews at the wrong time, God still looks on my heart.” No, because those who come at the wrong time do not gather with God, because God has already gathered with His children on other days, even a whole month earlier in 2024. And it's true, God actually looks into your heart and can see that you prefer to celebrate the wrong days out of cowardice and convenience, because keeping the biblical days of God would bring you problems in the church and family.
  The fact is: either we obey God or we disobey Him, and this is especially true for Yom Kippur, because the priests of the Israelites and many Christian churches would die on the wrong Yom Kippur if they entered the Holy of Holies of the Temple, as disobedience brings death. The entire church would then be responsible for the death, as everyone had cowardly remained silent and participated. Yes, God looks at the heart, and He sees that the Jewish priests and the Christian pastors have no interest in Yahweh/Jesus' calendar, but invent their own feast days. They have led the believers away from the days of assembly with God. Unbelievable, and they now expect God to support this disobedience and gather a second time, i.e. that would be a total of at least 14 annual/High Sabbaths for different groups? No, certainly not, there are only 7 annual/High Sabbaths and only 7 days of assembly with God, not 14, 21 or more.
• Different beginning of the month: God's calendar described in the OT (Tanakh) is a purely astronomical calendar in which each month begins with the first visible crescent moon (the so-called "New Light"). This is what God has determined (not us). However, the current Jewish calendar is inaccurate because it is only based on statistical averages. A month can start one or even several days before or after the first visible crescent moon (i.e. much too early or much too late). In other words, the first visible crescent moon over Jerusalem (the new light) is not determined in the Jewish calendar, but is only statistically assumed/guessed (it's a guessing game) and is off by 1-3 days per month in many years. As a result, the annual feast days (High Sabbaths) also fall on the wrong days of the week and the Passover is not exactly on the night of the full moon, as it was at the time of the Exodus. In the 4th century AD, the patriarch Hillel II determined the beginnings of the months, the duration of the months and leap years, thus ending the new moon sighting ordered by God. 
  In the diaspora (dispersion of the Jews across the earth), the mathematical Jewish calendar made sense because the Israelites living in exile could no longer see the first crescent moon (the new light) over Jerusalem. This meant that the Israelites, who were scattered all over the world, could celebrate all the holidays together and plan them in advance, which prevented chaos. However, when the Jews were allowed to return to their homeland of Israel and the state of Israel was "born" on March 14, 1948 (the fig tree began to grow again), they unfortunately did not adopt God's calendar described in the Old Testament (Tanakh), but kept their new Jewish calendar from the 4th century. From 1967 at the latest (liberation of Jerusalem), the Jewish calendar no longer makes sense because everyone can see the first crescent moon (the new light) over Jerusalem again for themselves. God's original calendar should therefore have been reintroduced, as described in Leviticus 23. God is the one who created the sun, moon and stars and only he has the right to determine the calendar and the setting of the feast days. Israel is also disobedient on this point and prefers to follow their own rabbinical traditions (which many Christians follow) which contradict the Creator, so that the feast days are often wrongly timed and are NOT agreed assemblies (moedim) with God/Jesus.
• Different number of days in a month: God's calendar does not have a standardized number of days. Each month can have either 29 or 30 days, depending on the astronomical parameters. However, the Jewish calendar has a predetermined number of days in each month (see Wikipedia). Thus, the length of the month is not calculated according to God's astronomical clock, but according to Jewish tradition, which is partly based on the calculations from the time in Babylon. In the biblical calendar, the months are usually numbered rather than named. Only the first month Abib (Aviv; Ex 34:18) had a name meaning "barley ripeness" (ear ripeness). In post-exilic literature (cf. Neh 2:1), the month is called by its Babylonian name "Nisan". The Babylonian month names were adopted in the Jewish calendar and are still used in Israel today. They indirectly indicate that the people of Israel were expelled from their land because of their disobedience, where they adopted the Aramaic language (see Languages of the Bible) and also some pagan calendar traditions.
• Different beginning of the year: In the Book of Leviticus, God appointed the month of Abib (Nisan) as the first month, but the Hebrew calendar (see Wikipedia) begins in the seventh month (Tishri) of the religious year, which is the first month of the civil (state) year/calendar. This means that the spiritual and symbolic significance of the feast days is completely lost. God's calendar begins in spring, when life awakens, when the first ears of barley can be harvested and it becomes lighter and lighter. But the Jewish calendar begins in the fall, when the harvest is already over, when plant life ends and it gets colder and darker. The spiritual connection between the feast days and the harvest seasons (which also reveal God's plan for humanity) is therefore completely lost from view in the Jewish calendar. The Encyclopædia Britannica describes the calendrical change correctly:
  „In the religious calendar, the commencement of the month was determined by the observation of the crescent New Moon, and the date of the Passover was tied in with the ripening of barley. The actual witnessing of the New Moon and observing of the stand of crops in Judaea were required for the functioning of the religious calendar. The Jews of the Diaspora, or Dispersion, who generally used the civil calendar of their respective countries, were informed by messengers from Palestine about the coming festivals. This practice is already attested for 143 BCE. After the destruction of the Temple in 70 CE, rabbinic leaders took over from the priests the fixing of the religious calendar. Visual observation of the New Moon was supplemented and toward 200 CE, in fact, supplanted by secret astronomical calculation. But the people of the Diaspora were often reluctant to wait for the arbitrary decision of the calendar makers in the Holy Land. Thus, in Syrian Antioch in 328–342, the Passover was always celebrated in (Julian) March, the month of the spring equinox, without regard to the Palestinian rules and rulings. To preserve the unity of Israel, the patriarch Hillel II, in 358/359, published the “secret” of calendar making, which essentially consisted of the use of the Babylonian 19-year cycle with some modifications required by the Jewish ritual.“
  Already in the book of Exodus 34:22, God commanded that the feast of the harvest (grape and olive harvest) should take place at the end of the biblical year, literally “at the year's end"; however, the Jews did not adhere to this, but determined the time of the grape and olive harvest at the beginning of their year, when the Jewish year begins. Thus they lose the meaning and the connection between the different harvest times of the crops and the spiritual symbolism in God's plan for mankind. The Jews refer to the 1st day of the 7th month (in the fall) as the “beginning of the year” (Rosh haShanah), but not the 1st day of the 1st month of Abib/Nisan (in the spring, when life begins). This is a serious error that clearly contradicts the word and calendar of God.
• Different determination of the first month of the year and leap years: As the solar year is longer than 365 days, but the lunar year (354 days) is shorter, there must be a leap month approximately every third year to prevent the feast days from wandering throughout the year, as is the case with the Islamic calendar. To ensure that the beginning of the year can always be determined with certainty, the degree of development of the plants, especially the early grain (barley), must be taken into account. Some theologians and pastors make the mistake of always starting the first month of the year with the first visible crescent moon after the equinox. This is wrong, because the decisive criterion was always the condition of the early grain (barley), which had to be in the "abib" stage of ripeness (already developed, still somewhat soft grains that can be roasted and eaten) (see harvest times). 
  On the day after the High Sabbath (15th of Nisan, Passover), i.e. the 16th Abib/Nisan, the sheaf of firstfruits was offered in the temple, and only then was the barley harvest allowed to begin. But if we had started the first month a month later, the barley grains would have fallen to the ground, which would have had a terrible symbolic meaning. Therefore, the farmers and the priests always went to the fields before the beginning of the month and checked whether the barley was ripe enough to be harvested in the middle of the month (on the 16th of Abib; Omer). If the barley was not yet ripe, a leap month was inserted. Thus there was always a harmony between God's calendar and the harvest times. God's calendar is not only an astronomical calendar, but also an agricultural calendar that perfectly combines both aspects in harmony. All of God's festivals are also harvest festivals in the three harvest seasons: in spring (Passover: barley), in summer (Pentecost/Shavuot: wheat) and in fall (Yom Teruah, Yom Kippur, Sukkot: grapes and fruit, later olives).
  The crucial point is this: In God's calendar, the degree of ripeness of the early grain (barley) determines when the first month of the year begins. But in the Jewish calendar, leap years are determined mathematically (see Wikipedia). As a result, in some years the harvest of the early grain (see Omer) at Passover would be problematic or not possible. See the chapter on harvest times in Israel. In the Jewish calendar, the leap years are determined mathematically (without regard to astronomy and nature) and occur only seven times within a cycle of 19 years (in the 3rd, 6th, 8th, 11th, 14th, 17th and 19th year). Thus, the connection to the equinox is often lost, which is a big mistake. In 2024, the barley in the fields in Israel was already harvested one month before the start of Passover 2024, so there could have been no more firstfruits.
• The equinox: Due to the observance of the ripeness of the early grain (barley) and the correct determination of the leap year, the spring and fall feasts in God's calendar are always near the equinox (on March 19-21 and September 22-24), but in the Jewish calendar they are often a month later, i.e. much too late (out of season). Since the Jewish calendar inserted an additional 13th leap month at the wrong time in 2024, the biblical calendar and the Jewish calendar were a whole month apart in 2024. This means that the Jews and also some Christian groups (such as the Church of God) celebrate all 7 feast days at the wrong time and do not gather with the God of the Bible and Jesus, but with themselves, with the Jews or with another god. Again, the Jewish spring and fall festivals of 2024 were a whole month after the equinox, which is absolutely impossible in God's biblical calendar.
• Different offerings of the First Fruits: The years 2023 and 2024 in particular show how important a correct calculation is, because there is a whole month between the astronomical biblical calendar and the imprecise mathematical Jewish calendar, so that the day of the firstfruits of barley (16th of Nisan) is also extremely different (March 27 or April 24, 2024). At the end of April/beginning of May 2024, there will be almost no barley left in the fields of Israel (except in the highlands), as the barley grains fall to the ground quickly and have to be harvested beforehand. Some photos of the harvest times in Israel in 2024 prove that the Jewish calendar completely miscalculates the leap month and the Omer in 2024. God has commanded that the harvest of early grain may only begin after the sheaf of firstfruits is waved in the temple on the 16th of Nisan, but in 2024 farmers must harvest earlier. If they had to wait until April 24, they would lose part of the harvest. In 2020 and 2023, both calendars were identical for Passover. 
• Babylonian elements: As already indicated, the Jewish calendar contains some calculation principles taken over from Babylon (number of days, monthly cycles, leap years), but God's calendar is much older and contains only the words of God and his astronomical and agricultural principles.
• Unity between moon and nature: The biblical calendar of God ALWAYS pays exact attention to the new light of the moon and to the state of nature to determine each month, especially with regard to the degree of ripeness of the grain, but the imprecise Jewish calendar pays no attention to the new light, the state of nature or the equinox, but only assumes (it's a guessing game) everything on the basis of statistical averages.
• Complicated instead of simple: The calendar of God is very easy to understand and logically structured. Anyone can see when a month (and therefore also a year) begins and which day of the month it is currently in without a computer by looking at the moon's illumination. Even children can easily understand God's calendar and determine the day of the month based on the brightness of the moon. But the Jewish calendar has lost the connection with nature. The Jewish calendar is very complicated and illogical and when a person sees the first crescent moon and the full moon at night, he can only hope that it is the beginning of the month (or year) and the middle of the month, because the Jewish calendar is often off by one or more days, sometimes even a month. Thus also the feasts of God are on the wrong days and there is an uncertainty whether the right days are kept according to God's will. In the calendar of God this uncertainty never exists.
• It is not just a matter of obedience or disobedience, but of life and death: Only once a year (on the High Sabbath of Yom Kippur) was the high priest allowed to enter the Holy of Holies in the temple. If he entered on a wrong day, which did not correspond to God's calendar, he had to die. For this reason, the high priest often had a sheath tied around his body so that he could be pulled out if he died, because no other person was allowed to enter this area. If the priest followed the Jewish calendar invented by man (Hillel II) and currently still used in Israel, he would have died upon entering the Holy of Holies in the Temple. So the difference between these two calendars has not only to do with different teachings and opinions, but it is even a matter of life and death. If there is to be a temple in Jerusalem again, then this must be carefully considered. If there were still a temple in Israel today, the priest would have to die in many years when he enters the Holy of Holies in the temple. The Jewish Yom Kippur (Day of Atonement) would therefore often be a funeral day. So it would be in 2021, when the Day of Atonement (Yom Kippur) was celebrated 2 days early in Israel. In 2020, the priest would not die because the biblical and Jewish calendars fell on the same days. However, in 2024, the Jewish Yom Kippur was a whole month after the biblical Yom Kippur. The High Priest of the Jews, the Messianic Jews/Christians, the Adventist and the Church of God would have died on that day; it would not be a holiday or an appointment with God, but a day of mourning and an appointment with the grave.
• Many Christians are disobedient: Not only the Israelites are disobedient and prefer their own calendar, but also some Christian groups. They celebrate the Sabbath and the Jewish feasts, but not the feasts of God/Jesus, because they calculate their feasts according to the Jewish calendar, but not according to God's/Jesus's biblical calendar. So they celebrate with themselves and with the Jews (who reject our Lord Jesus as the Messiah), but they do NOT gather with the God of the Bible, for He Himself has established completely different feast days. Those who come too early or too late gather at times when God and Jesus are not particularly close.
  Many pastors are spreading the false doctrine that today's modern Jewish calendar is supposedly the old calendar from Leviticus 23, which is absolutely wrong, as has already been proven. This not only divides worldwide Christianity, but (what is even worse) it leads them away from the biblical days of assembly (moedim) with God. Some members in such churches (e.g. Church of God) often think they are the only converts or the better Christians and do not even realize that they themselves are living in disobedience and have postponed almost all of God's feast days. And the worst thing is that they either exclude those who point out these errors from the church or delete/censor their comments on YouTube and block them. By doing so, they reveal their unloving attitude not only towards other Christians, but also towards God Himself, because no one has the right to postpone God's feast days (the days of assembly with God) and then also expect God to be guided by people when they want to celebrate and rest. Like the Jews, some Christians place their own traditions and teachings of men (e.g. Herbert W. Armstrong or Ellen White) above the Word of God.
• Calendar differences of several days/weeks: The calendar described in the Old Testament (OT, or Tanakh) is clearly defined on the basis of astronomical facts; but the current Jewish (Hebrew) calendar is an invention of people who try to approximate God's calendar but do not want to adopt it. In some months the two calendars are identical, as in 2020, when Passover and therefore Pentecost (Shavuot) fell on exactly the same feast days in both calendars. But in many years there are differences of one or even several days, in extreme cases even by several weeks, if the leap years are calculated incorrectly. In 2021 there were differences of 1-2 days between the two calendars, in some years both calendars are almost identical (e.g. 2020, 2023) and in other years (e.g. 2024) there is a whole month in between, examples:

The Jewish mathematical calendar of Israel 2021 according to Hillel (e.g.  Chabad,  Hebcal,  Aish,  HaGalil):
     Passover (Nisan 15): March 27/28, 2021 (15th day of the 7th month).
     Shavuot: May 16/17, 2021 (the 50th day after Passover).
     Tisha B'Av: July 17/18, 2021 (9th day of the 11th month)
     Tu B'Av: 23/24 July 2021 (15th day of the 11th month)
     Yom Teruah: September 6/7, 2021 (1st day of the 1st month)
     Yom Kippur: September 15/16, 2021 (10th day of the 1st month)
     Sukkot: September 20-27, 2021 (15th-21st day of the 1st month)
     Shemini Atzeret: September 28, 2021 (22nd day of the 1st month).

God's Biblical Astronomical Calendar 2021 (e.g. TorahCalendar):
     Passover (Nisan 15): March 28/29, 2021 (15th day of the 1st month).
     Shavuot: May 17/18, 2021 (the 50th day after Passover)
     Tisha B'Av: July 19/20, 2021 (9th day of the 5th month)
     Tu B'Av: 25/26 July 2021 (15th day of the 5th month)
     Yom Teruach: September 8/9, 2021 (1st day of the 7th month)
     Yom Kippur: September 17/18, 2021 (10th day of the 7th month)
     Sukkot: Sept. 22-29, 2021 (15th-21st day of the 7th month)
     Shemini Atzeret: Sept. 30, 2021 (22nd day of the 7th month)

In 2023, the first 3 biblical feast days in spring/summer fall on the same feast days in both calendars (see 2023). First the Jewish feasts of Israel are mentioned (red), the bold marked data correspond to the calendar of God. They are correct and independently confirmed by Christians worldwide (e.g. TorahCalendar.com):

Between the 7 biblical feast days in 2024 (High Sabbaths, annual Sabbaths) according to the biblical calendar of God (marked in bold) and according to the imprecise Jewish calendar of Israel (marked in red), there is even a whole month in between in 2024:

1.) Passover 1 (Nisan 15):  Mon/Tue, March 25/26, 2024 - Mon/Tue, April 22/23, 2024 [5784]

• Correct determination of the biblical feast days: Today we have astronomical data (e.g. from NASA) with which the first crescent moon (the New Light), which can be seen over Jerusalem in most months, can be determined with certainty. Thus, all dates of the biblical calendar can be calculated in advance (dated) or backdated by several millennia. However, it must be noted that the leap months (about every three years) must be calculated correctly, because this is where most errors occur. 
  Fortunately, there is the website TorahCalendar.com, which lists the feast days in God's biblical calendar. This is not our website, but many other Christians around the world confirm what we say. This website even proves the resurrection of Jesus on a Sabbath, because only those who really know God's calendar can understand God's statements in the resurrection chapter of the NT. All others will not know what a “first Sabbath” (Mark 16:9) is supposed to be. Ignorance opens the door to delusion, while knowledge of the Word of God protects us from error and deception, so that we will be able to contradict Satan and his many followers, as Jesus did by quoting the Word of God often. Love fights against seduction and false teachings because it wants to protect others. 
• The calendar of Jesus Christ: This was and is only the biblical calendar of God from the time of the Exodus, but not the mathematical Jewish calendar of God, which is used in Israel today, because it did not even exist at the time of Jesus, because it was only invented centuries after Jesus' death, and by rabbis of all people, who reject Jesus as the Messiah and make fun of Him as the alleged "Messiah who failed on the cross". 
• The calendar of the first Christian church: This was and is only the biblical calendar of God from the time of the Exodus, but not the mathematical Jewish calendar of God that is used in Israel today, because it did not even exist at the time of the first Christian church, because it was only invented centuries after Pentecost and after the founding of the first church.
• Prophetic data, first appearance of Jesus, rapture and return of Christ: The time of the first and second coming of the Messiah was determined by God/Jesus in the biblical calendar. First he was to appear to pay for the sins of the world through His death, then at his second coming to save the world from complete destruction and to establish the kingdom of peace. In between lies the Rapture. However, neither the first appearance of the Messiah 2,000 years ago nor the Rapture or the Second Coming of Jesus have ever been calculated according to the Jewish calendar. If one of these dates should fall on the same days, it is only a coincidence, but the basis for the calculation was not God's astronomical calendar.
• 3-Dimensional Calendar: The specific star constellations in the night sky in the respective months indicate apart from the season also the exact geographical position; thus each humans can orient themselves on earth on the basis of sun, moon and stars exactly in time and space. God's calendar is thus an astronomical, agricultural, and geographical calendar (3-dimensional) that combines nature and time into a perfect harmonious unity. No other calendar in the world offers this accuracy, so only this calendar will last forever. But the Jewish calendar is inaccurate and in some years deviates from God's calendar not only by a few days, but even by a whole month, because the leap years are calculated incorrectly and the state of nature is not taken into account. This is a big mistake. The Jewish calendar is not three-dimensional, because it does not pay attention to the first visible crescent moon (new light) over Jerusalem, nor to the state of nature (ripeness of the barley), nor to the equinox, nor to the constellations of the stars. It is merely based on the mathematical rules made up at the desk by the Jews, who were expelled worldwide by the Romans from 70 AD. That is why it is still called the "Jewish calendar" today, but NOT "God's calendar" and also NOT the "biblical calendar". 
• Future and eternity: When God re-establishes His kingdom on this earth, there will again be the calendar of God described in the Tanakh worldwide and never again the present Hebrew calendar. The Jewish calendar will be abolished, but God's calendar will be introduced worldwide. Then, of course, the Gregorian (Catholic) calendar will no longer exist. God's calendar is ingenious, because only this calendar combines the celestial bodies (sun, moon, stars), nature (phenology, stage of development of plants, harvests), geographical location and time into a harmonious unity. Only the calendar of God/Jesus offers perfect temporal and spatial (geographical) and agricultural (nature) harmony.

If someone has a different opinion and equates both calendars, he is invited to show us the possible errors in the above points on the basis of the OT (Tanakh). So far, no one has succeeded in doing so, and we also have good contacts in Israel who confirm the above and the differences. The following list shows the different feast dates in the two calendars and clearly shows that in many years a high priest in Israel would die if he entered the Holy of Holies in the Jerusalem Temple on the wrong day:

The example of the foundation of the state of Israel shows how important it is to differentiate between the Jewish and the biblical calendar, because otherwise important prophetically predicted events cannot be correctly classified in their symbolism. In the first mentioned calendar often the leap years and therefore also the feast days are calculated wrongly. The day of the birth of Israel on Friday, May 14, 1948 was in the Jewish calendar only the 5th Iyar (5th day of the 2nd month); but in the biblical calendar of God it was the 4th Sivan (4th day of the 3rd month), thus directly the day before the 7th Sabbath in the Omer-counting and even directly before the Pentecost (beginning from sunset on May 15, 1948; see TorahCalendar). This is symbolically of great significance, for thus the birth/founding of Israel (prophetically: the unfaithful bride) occurred at the time of Pentecost, just as the birth/founding of the New Testament Church (prophetically: the bride of Christ) occurred at Pentecost (Acts 2). So there was a great Pentecostal miracle not only in the year of Jesus' resurrection, but also in May 1948, the year of Israel's rebirth. Due to the fact that the Jews (as well as the Messianic Christians, the Seventh-day Adventists and the Church of God) reject the calendar of God, although it was the original calendar of their fathers, this important basic knowledge remains hidden from them and many are not aware of God's involvement in the founding of the state, so that they do not thank Him. They do not know that the oft-quoted newspaper "The Palestine Post" (pictured) proclaimed the birth of Israel to the entire world exactly on May 16, 1948, and that day was Pentecost! So the official and worldwide proclamation of the foundation of the state of Israel (The Independence Day) took place on a Pentecost day, on Sunday, May 16, 1948. This also means: The beginning of the fig tree generation was officially announced on a Pentecost day to all Christians who are waiting for the coming of their Lord (see Rapture). Thus they have a clue how to reckon. 

In Jewish circles, there is a strong interest in hiding God's calendar from the world. Why? Because the opinion is spread that the Jewish calendar is allegedly biblical and should correspond to the will of God. This is completely false, as has already been proven above in the text. Many Christian churches have fallen into this trap, such as the Adventists, the Messianic Jews/Christians (e.g. Amir Tsarfati) and the Evangelicals. Even the Church of God does not align its feast days according to what the Bible says, but according to the Jewish calendar with its own rabbinic traditions. Thus, they usually celebrate their "biblical feast days" at the wrong time and thus gather not with God but with themselves or with other gods. The fact is: The Jewish calendar is not the calendar of God mentioned in the Bible (Tanakh), but is the calendar of Jews who have made up their own traditions, which they follow until today. The Jewish calendar is NOT the biblical and purely astronomical Luni-Solar calendar, as many Jews and Christians falsely claim, but a mathematical calendar with Babylonian calculations that ASSUMES the first crescent moon over Israel (the New Light) and the first month of the year based only on statistical averages. The calendar of the Bible was and is also the calendar of Jesus Christ and this is also the only calendar which will have eternal existence. The Jewish calendar, on the other hand, which is partly based on Babylonian specifications, has no future. It will never succeed to hide the calendar of God from the world, because it is mentioned in the Bible and therefore everybody can get to know it, even if some Jews and Christians want to hide it or replace it.

Because so many Christians prefer to listen to such videos instead of reading the Bible and completely neglecting the Old Testament, they fall into this trap and are deceived. This is very sad and frustrating. Jesus (a descendant of David) repeatedly criticized the Jews for putting their own rules and traditions before the Word of God:

Mk 7:6-9: „And he said to them, “Well did Isaiah prophesy of you hypocrites, as it is written, “‘This people honors me with their lips, but their heart is far from me; 7 in vain do they worship me, teaching as doctrines the commandments of men.’ 8 You leave the commandment of God and hold to the tradition of men.” 9 And he said to them, “You have a fine way of rejecting the commandment of God in order to establish your tradition!“

After the Rapture, the Jews will have to go through the 7-year tribulation. They will then look to Jesus and His love, whom they have rejected until then. He came to His people, but His own relatives did not recognize Him and rejected Him: 

Jn 1:1-11: „In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God. 3 All things were made through him, and without him was not any thing made that was made. 4 In him was life, and the life was the light of men. 5 The light shines in the darkness, and the darkness has not overcome it.. 9 The true light, which gives light to everyone, was coming into the world. 10 He was in the world, and the world was made through him, yet the world did not know him. 11 He came to his own, and his own people did not receive him. 12 But to all who did receive him [the Christians from the Gentile nations], who believed in his name, he gave the right to become children of God, 13 who were born, not of blood nor of the will of the flesh nor of the will of man, but of God.“ 

Isaiah 7:14 and chapter 53, Psalm 22 clearly testify about Jesus. Isaiah 53 is the "forbidden chapter", which must not be read in the synagogue, because it creates too much unrest, because it reports prophetically about Jesus. Every Jew in Israel and all over the world should know this:

Acts 4:10-12: „let it be known to all of you and to all the people of Israel that by the name of Jesus Christ of Nazareth, whom you crucified, whom God raised from the dead - by him this man is standing before you well. 11 This Jesus is the stone that was rejected by you, the builders, which has become the cornerstone. 12 And there is salvation in no one else, for there is no other name under heaven given among men by which we must be saved.“

The biblical calendar of God, which is defined in Leviticus 23, is a purely astronomical luni-solar calendar. This means that the sun, moon and stars are not only lights, but also determine the calendar and the feast days. The calendar of God is ingenious because it combines nature and time into a harmonious unity. It is defined by 7 points:

1. Sun & Day: Each day begins and ends after sunset. Thus, the sunrise in the morning is in the middle of a whole calendar day and ends at the beginning of darkness (see Day).

2. Week: A week consists of 7 days and the 7th day is called "Sabbath" (= ceasing, resting; see Sabbath and week).

3. Moon & Month: Each month begins with the first visible crescent moon over Jerusalem, which is called "new light". In the middle of each month there is a full moon. In addition to the weekly Sabbaths, there are also 7 annual Sabbaths ("High Sabbaths") that fall on different days of the week from year to year, depending on which day of the week the first crescent moon can be seen first in the 1st and 7th months. 

4. Month & Days: Each month has 29 or 30 days.

5. Year & Months: A year normally has 12 months. However, since the lunar year is about 10,87 days shorter than the solar year, there is a leap year about every third year with an additional month to bring the calendar in line with nature (phenology). Thus, the spring festival of Passover (Nisan 15) and the autumn festival of Sukkot (Tishrei 15) always fall near the equinox. All 7 feast days of God are therefore always in the right season. Since Passover is a spring festival, it may not be celebrated in winter; therefore, the first high Sabbath of the year (Nisan 15) is always either on (e.g., 2011) or usually after the day of the spring equinox but never before. The leap year also prevents the feast days from moving throughout the year, as is the case with the lunar calendar. The leap year also prevents the feast days from wandering throughout the year, as is the case with the lunar calendar. 

6. Nature: The first month of the year is determined by observing nature, especially the ripeness of the early grain (barley), more precisely according to the state of maturity called "abib" (fresh young barley ears, Strong No. 24), which occurs only once a year. These are the young ears of barley, full-sized and already starchy, which are not yet fully cured but can already be harvested, roasted and eaten. At the end of the year, when the farmers and priests saw that the barley was still too unripe to be cut in the middle of the month, an extra month was added by the high priest. This way, the first month of the year could always be defined without dispute, and the first ears of barley (first-fruits sheaf, Omer) could always be presented as a wave offering in the temple at Passover. Thus, all 7 feast days were always within the range of the harvest seasons in Israel, which also indicates their symbolic spiritual significance in God's plan with humankind. 

See Barley and Wheat Harvest in Israel.

7. Stars: The specific star constellations in the night sky in the respective months indicate apart from the season also the exact geographical position; thus each humans can orient themselves on earth on the basis of sun, moon and stars exactly in time and space. God's calendar is thus an astronomical, agricultural, and geographical calendar (3-dimensional) that combines nature and time into a perfect harmonious unity. No other calendar in the world offers this accuracy, so only this calendar of God will last forever.

The calendar of the Bible (God's calendar) and the seven feast days of God show a connection with the harvest seasons and God's plan for humankind:

Spring (feast of spring fruits: barley): 

1)     1st month Nisan, 15th day: Passover 1, 1st day of unleavened bread  (Pesach 1)

2)     1st month Nisan, 21st day: Passover 7, 7th day of unleavened bread  (Pesach 7)

Summer (feast of summer fruits: wheat):

3)     The 50th day after the first High Sabbath: Pentecost  (Shavuot, Feast of Weeks) 

Autumn (feast of late fruits: grapes and fruits):

4)     7th month Tishrei,   1st day: Day of Trumpets  (Yom Teruah) 

5)     7th month Tishrei, 10th day: Day of Atonement  (Yom Kippur)

6)     7th month Tishrei, 15th day: Feast of Tabernacles  (Sukkot, 15th-21st day)

7)     7th month Tishrei, 22nd day: Last Great Day of Assembly (Shemini Atzeret, 8th day of assembly, conclusion)

As already mentioned, in 2020 and 2023 the Jewish calendar fell on the same feast days as God's biblical calendar for Passover. But in many years, the Jews and also some Christian groups (Adventists, Church of God, Messianic Jews/Christians...) celebrate the wrong feast days because they are not guided by the Bible, but by the human traditions of old rabbis. 

Isaiah 53:1-12: Who has believed what he has heard from us? And to whom has the arm of the Lord been revealed?

2 For he grew up before him like a young plant, and like a root out of dry ground; he had no form or majesty that we should look at him, and no beauty that we should desire him.

3 He was despised and rejected by men, a man of sorrows and acquainted with grief; and as one from whom men hide their faces he was despised, and we esteemed him not.

4 Surely he has borne our griefs and carried our sorrows; yet we esteemed him stricken, smitten by God, and afflicted.

5 But he was pierced for our transgressions; he was crushed for our iniquities; upon him was the chastisement that brought us peace, and with his wounds we are healed.

6 All we like sheep have gone astray; we have turned - every one - to his own way; and the Lord has laid on him the iniquity of us all.

7 He was oppressed, and he was afflicted, yet he opened not his mouth; like a lamb that is led to the slaughter, and like a sheep that before its shearers is silent, so he opened not his mouth.

8 By oppression and judgment he was taken away; and as for his generation, who considered that he was cut off out of the land of the living, stricken for the transgression of my people?

9 And they made his grave with the wicked and with a rich man in his death, although he had done no violence, and there was no deceit in his mouth.

10 Yet it was the will of the Lord to crush him; he has put him to grief; when his soul makes an offering for guilt, he shall see his offspring; he shall prolong his days; the will of the Lord shall prosper in his hand.

11 Out of the anguish of his soul he shall see and be satisfied; by his knowledge shall the righteous one, my servant, make many to be accounted righteous, and he shall bear their iniquities.

12 Therefore I will divide him a portion with the many, and he shall divide the spoil with the strong, because he poured out his soul to death and was numbered with the transgressors; yet he bore the sin of many, and makes intercession for the transgressors.

"But you, Daniel, shut up the words and seal the book, until the time of the end.

Many shall run to and fro, and knowledge shall increase."

(Daniel 12:4)

 "Prove all things; hold fast that which is good. Abstain from all appearance of evil"

(1Thessalonians 5:21-22)

"Take no part in the unfruitful works of darkness, but instead expose them"

(Epheser 5:11)