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This table gives an overview of each calendar and a quick comparison between them. For in depth information about any calendar just click on its name. For an explanation of the data given in any column just click 'Explain' at the top of that column.
This page was updated on Monday 8th January 2001 AD (Gregorian).
| Calendar | Start date (in Gregorian) |
No. of days per year |
No. of months per year |
Correction applied |
| Astronomical | 365.24219 approx |
|||
| Aztec Sacred |
260 | 20 of 13 days | ||
| Aztec Solar |
365 | 18 of 20 days + 5 days |
||
| Babylonian | 365.2467463 | 12 each of 29 or 30 days |
Intercalary month added every 19 years | |
| Bahai | 21 Mar 1844 AD | 365.2425 | 19 of 19 days and 4 or 5 feast days |
If year is divisible by 4 then it is a leap year. If year is divisible by 100 then it is not a leap year. If year is divisible by 400 then it is a leap year. |
| Chinese | 2637 BC | 353 to 385 | 12 or 13 of 29 or 30 days |
Intercalary month added according to complicated rules. |
| Egyptian | 365 | 12 of 30 days + 5 days |
No correction applied. | |
| English | Unknown | 12 | ||
| French Revolutionary |
22 Sept 1792 AD | 365.24225 | 12 of 30 days + 5 or 6 days |
Years 3, 7 & 11 were leap years. Calender abolished in year 14. |
| Greek Orthodox |
365.24222 | 12 in total. 7 x 31, 4 x 30, 1 x 28 or 29 |
If year is divisible by 4 then it is a leap year. If year is divisible by 100 then it is not a leap year. If year divided by 900 leaves a remainder of 200 or 600 then it is a leap year. |
|
| Gregorian | In theory - 1 Jan 1 AD. In practice. |
365.2425 | 12 in total. 7 x 31, 4 x 30, 1 x 28 or 29 |
If year is divisible by 4 then it is a leap year. If year is divisible by 100 then it is not a leap year. If year is divisible by 400 then it is a leap year. |
| Hebrew | 3761 BC | 354 approx |
12 or 13 each of 29 or 30 days. |
If year divided by 19 leaves a remainder of 0, 3, 6, 8, 11, 14 or 17 then it is a leap year and has 13 months. |
| Hebrew Jubilee |
364 | 12 of 30 days + 1 extra day in each quarter. |
No correction applied. | |
| Indian | 22 Mar 79 AD | 365.2425 | 12 in total 5 x 31 7 x 30 |
If year is divisible by 4 then it is a leap year. If year is divisible by 100 then it is not a leap year. If year is divisible by 400 then it is a leap year. |
| Islamic (Hijri) |
16 July 622 AD | 354.36 | 12 length variable. |
The calender is based on the first sighting of the moon each month and therefore difficult to predict. |
| John Dee | Not adopted |
365.2424 | 12 in total. 7 x 31, 4 x 30, 1 x 28 or 29 |
It is a leap year if the year number modulo 32 is not zero and is divisble by four with no remainder. |
| Julian | 45 BC | 365.25 | 12 in total. 7 x 31, 4 x 30, 1 x 28 or 29 |
If year is divisible by 4 then it is a leap year. |
| Lunar | 354 | 12 in total. 6 x 29, 6 x 30 |
No correction applied. | |
| Mayan Sacred |
12 Aug 3113 BC | 260 | 20 of 13 days | No correction applied |
| Mayan Solar |
12 Aug 3113 BC | 365 | 18 of 20 days + 5 extra days |
No correction applied |
| Nepalese | 56 BC | varies | 12 of 29 to 32 days | Calculated by astrologers |
| Persian | 22 Mar 622 AD | 365.2422 | 12 in total 6 x 31, 5 x 30 1 x 29 or 30 |
One extra day inserted according to the time of the vernal equinox producing a cycle which lasts 33 years. |
| Roman | Approx 750 BC | Standard 355 Ave. 366.25 |
12 in total. 1 x 28, 7 x 29, 4 x 31 |
An additional month of either 28 or 29 days in alternate years. |
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