Recognised as Date
23 March 1264
- Sunday
- Q1
- Leap year
- Week 12
- Aries
23 March 1264 falls on a Sunday in the proleptic Gregorian calendar, which did not yet exist at the time. It was day 83 of 366 in 1264, a leap year, falling in week 12 and quarter 1. Its Unix timestamp is -22,272,105,600.
Calendar position
Day of the weekSundayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month23rd
Day of the year83 of 366
Days remaining in the year283
Days elapsed in the year82
ISO week numberWeek 12ISO 8601, weeks start on Monday
Week of the month4th
Occurrence in the month4th Sunday
QuarterQ1 1264
Year1264
Days in the month31
Leap yearYes, 366 days
This date in other formats
ISO 86011264-03-23
British (D/M/Y)23/03/1264
American (M/D/Y)03/23/1264
Long formSunday 23rd March 1264
RFC 2822Sun, 23 Mar 1264 00:00:00 GMT
Compact12640323
In wordsthe 23rd of March, one thousand, two hundred and sixty-four
Julian calendar equivalent16 March 1264the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew16 Adar II 5024the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)16 Jumada I 662 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)4 Farvardin 643the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die461,384days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-22,272,105,600seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-22,272,105,600,000
Relationship to the epoch257,779 days before the Unix epoch
Julian Day Number2,182,809midnight UTC
Days since 1 January 1900-232,212
Days since 1 January 2000-268,736
Relative to today
These values depend on today’s date and change daily.
Today13 September 2026
Days ago278,488 days
In other terms762 years, 167 days and 12 hours
Weeks39784.0 weeks ago
Anniversary this year174 days ago
Years elapsed762 complete years
Seasons & signs
Zodiac signAriesFire sign
Chinese zodiac yearRatthe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Springmeteorological seasons, by whole months
Season (Southern Hemisphere)Autumn
Easter Sunday that year23 March 1264
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