Calendrical Calculator

Type in the date you want to convert in the line of the respective calendar and click the "evaluate" button. The calendar used in most countries is the Gregorian calendar (first line of the form).

To convert today's date just click the "today" button.

See disclaimer and validity notes.

Gregorian calendar 
Julian calendar BCE CE
Jewish calendar  
Islamic calendar *  
Coptic calendar  
French Revolutionary calendar  
Julian Date **  
  Pictun Baktun Katun Tun Uinal Kin  
Mayan calendar  
  Faul Imperium Urlaubum Streß  before OF   OF   
OF calendar
  (The date will be considered to be given in the short form if no empire is specified.)

Disclaimer and Validity Notes

No guarantee can be given for the dates computed, as errors are always possible. If the result of a conversion is critical, or money, time, or workforce is to be spent depending on a conversion, further sources must be consulted to check the dates.

No range checking is carried out. On the results window, check the date entered (printed with bold letters). For instance, a date 32 December 1999 will be treated as 1 January 2000.

Gregorian dates before 15 October 1582 will be computed but given italic as this calendar was not used before that date.

Dates of the Julian calendar before 1 January 8 CE will be printed italic because there have been some irregularities in the use of the calendar before the year 761 a. u. c., which was our 8 CE. For the same reason, Roman dates before the calends of January 761 a. u. c. (1 January 8 CE) will not be given.

The Jewish Calendar was fixed around the 10th century. Thus, Jewish calendar dates up to the 10th century are printed in italic letters as they probably do not correspond to the dates then used. An Adar II given in common years will be treated as Adar.

In France, the Revolutionary calendar was officially used from 24 November 1793 until 31 Dezember 1805, inclusive. However, it is possible to compute the dates of the Revolutionary calendar from 22 September 1792 (which was - in theory - 1 Vendémiaire I) until 22 September 1806 (which would have been the 5th complementary day XIV, had the calendar not been abolished). Dates that can be computed but are not in the period in which the calendar was valid are printed italic.

Mayan calendar dates are computed according to the Goodman-Martinez-Thompson correlation. The Mayan date 0 Pictun 0 Baktun 0 Katun 0 Tun 0 Uinal 0 Kin is considered to correspond to 6 September 3114 BCE (Julian). This day is described by Tzolkin date 4 Ahau and Haab date 8 Cumku; at least in this point the different correlations agree. By leaving aside the larger Mayan time units Calabtun, Kinchiltun, and Alautun, the supported range is "limited" to Julian dates (JD) between 584283 and 58184282, inclusively.




The date is calculated according to a schematic version of the Islamic calendar with the era 16 July 622 CE. Of a 30-year-cycle, the 2nd, 5th, 7th, 10th, 13th, 16th, 18th, 21th, 24th, 26th, and 29th years are leap years.


Only integer values may be entered as fractions of days are not taken into account. The JD is always interpreted as the JD of 12h UT.



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   © Holger Oertel 2000-2008; last change: 27 July 2008

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