Other Calendars

There are other calendars made by men that are not like God's calendar.

The word calendar comes from the word Kalends, which means to call out. When the Romans saw the new crescent moon, they would call out (latin "calare" - to call out) that a new month had begun - , or calendar. The first day of each new month based on the moon was called the Kalendae (first day of the month.)

Bablyonian Calendar

Greek Calendar

The greek calendar is thought to have been based on the Bablyonian calenar.

Roman Calendar

About 700 BCE, there was the Roman calendar which was based in part from the Greek calendar. The Roman calendar had the months: Martius, Aprilis, Maius, Junius, Quintilis, Sextilis, September, October, November, and December. The roman calender began with the month Martius which was around the spring equinox.

The month Sextilis comes from the word six which is "sex". In music we have the word sextet (six people singing). If you have six kids born together, they are sextuplets. If something happens six times per year, it happens sexennially. Sextilis was the sixth month of the Roman calendar.

The month September comes from the roman word for seven. If something happens seven times per year, then it happens septennially. A polygon with seven sides is called septilateral. September was the seventh month of the Roman calendar.

The Roman month October comes from the roman word for eight. Like octagon (equilateral polygon with eight sides). Or octilateral is a polygon with seven sides.The roman month october was the eighth month in their calendar.

The Roman month November comes from the roman word for nine. Nine people singing are called a nonet. November was the ninth month of the Roman calendar system.

The Roman month of December comes from the roman word for ten. Deci as in decimal. A number system based on 10 states is called denary. Decagon is a polygon with 10 sides. A decade is 10 years. The month December was the 10th month of the Roman Calendar.

The Roman calendar had 304 days and 10 months.

The Roman calendar had 10 days in each week. Each day was assigned a letter: A, B, C, D, E, F, G and H.

About 45 BCE, the Romans used a Julian Calendar which had 12 months. This calendar started with the month of March as the beginning of the year. 2 months had been added to the previous Roman calendar: January and February.

During Jesus' day, the Julian calendar would have been used. It had 12 months in the year and started with a month they called Martius.

Julian Calendar

The Julian calendar began with the month of March. It was named in honor of their god Mars.

The second month of the Julian calendar was April. Some say it honored the god Venus who had two festivals this month and others say it was named after a god Aper or Aprus.

The third month of the Julian calendar was May. Some say it was named after the goddess Maia, a daughter of Atlas.

The last month of the Julian calendar was February. That is why it had a shorter month of leftover days and why the leap day was added to February.

About 5 BCE the Romans left off using the moon to determine the beginning of each month and fixed the months at either 30 or 31 days.

Some say Jesus Christ was born about 5 BCE.

Gregorian Calendar

The Gregorian calendar was invented in about 1582. It was based on the Julian calendar system. It took several hundred years before many countries adopted it. It was invented to fix the length of the year of the Julian calendar system.

The Revised Julian Calendar

A few churches use a revised Julian Calendar.


The Gregorian calendar is opposite of God's calendar on all aspects. First the Gregorian calendar begins and ends a day at 12:00 AM. This is in opposition to God's calendar which begins with sundown.

The Gregorian calendar has a fixed number of days and is not in harmony with the month. This is opposite God's calendar which begins each month with a new moon (1st day) and has four 7 day weeks (6 working days and 1 day of rest) for total of 29 to 30 days.

The Gregorian calendar has a fixed number of months per year. God's calendar has 12 or 13 months (1 intercalary month) that make up a year to keep the lunar cycle in synchronization with the solar cycle.

The Gregorian calendar has a fixed 7 day week that goes on forever. God's calendar begins each month on new moon with a holy day. God's calendar has no days of the week named after Greek or Roman gods.

The Gregorian calendar has religions that worship on Sundays, Saturdays and Fridays as holy days. This rotating 7 days does not align with the days of the month. God's calendar always has holy days on the 1st, 8th, 15th, 22nd and 29th. These are the first day of the month and all the following sabbaths. The "holy days" of the Gregorian calendar do not match the holy days and sabbaths on God's calendar. You cannot use the Gregorian calendar to determine God's feast days which go by the days of the month and also coincide with God's holy sabbaths.


New Moon

7th day Sabbath

7 Feasts


Blood Moon

Feast of Tabernacles

Days of Week

Other Calendars

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