Recognised as Date
1 May 1251
- Monday
- Q2
- Common year
- Week 18
- Taurus
1 May 1251 falls on a Monday in the proleptic Gregorian calendar, which did not yet exist at the time. It was day 121 of 365 in 1251, falling in week 18 and quarter 2. Its Unix timestamp is -22,679,049,600.
Calendar position
Day of the weekMondayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month1st
Day of the year121 of 365
Days remaining in the year244
Days elapsed in the year120
ISO week numberWeek 18ISO 8601, weeks start on Monday
Week of the month1st
Occurrence in the month1st Monday
MonthMay (month 5 of 12)
QuarterQ2 1251
Year1251
Days in the month31
Leap yearNo, 365 days
This date in other formats
ISO 86011251-05-01
British (D/M/Y)01/05/1251
American (M/D/Y)05/01/1251
Long formMonday 1st May 1251
RFC 2822Mon, 01 May 1251 00:00:00 GMT
Compact12510501
In wordsthe 1st of May, one thousand, two hundred and fifty-one
Julian calendar equivalent24 April 1251the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew1 Iyyar 5011the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)30 Muharram 649 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)11 Ordibehesht 630the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die456,674days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-22,679,049,600seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-22,679,049,600,000
Relationship to the epoch262,489 days before the Unix epoch
Julian Day Number2,178,099midnight UTC
Days since 1 January 1900-236,922
Days since 1 January 2000-273,446
Relative to today
These values depend on today’s date and change daily.
Today14 September 2026
Days ago283,199 days
In other terms775 years, 130 days and 6 hours
Weeks40457.0 weeks ago
Anniversary this year136 days ago
Years elapsed775 complete years
Seasons & signs
Zodiac signTaurusEarth sign
Chinese zodiac yearPigthe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Springmeteorological seasons, by whole months
Season (Southern Hemisphere)Autumn
Easter Sunday that year16 April 1251
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