Recognised as Date
12 May 1243
- Tuesday
- Q2
- Common year
- Week 20
- Taurus
12 May 1243 falls on a Tuesday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 132 of 365 in 1243, falling in week 20 and quarter 2. Its Unix timestamp is -22,930,560,000. A full moon falls on this day.
Calendar position
Day of the weekTuesdayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month12th
Day of the year132 of 365
Days remaining in the year233
Days elapsed in the year131
ISO week numberWeek 20ISO 8601, weeks start on Monday
Week of the month2nd
Occurrence in the month2nd Tuesday
MonthMay (month 5 of 12)
QuarterQ2 1243
Year1243
Days in the month31
Leap yearNo, 365 days
This date in other formats
ISO 86011243-05-12
British (D/M/Y)12/05/1243
American (M/D/Y)05/12/1243
Long formTuesday 12th May 1243
RFC 2822Tue, 12 May 1243 00:00:00 GMT
Compact12430512
In wordsthe 12th of May, one thousand, two hundred and forty-three
Julian calendar equivalent5 May 1243the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew13 Iyyar 5003the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)14 Dhu al-Qidah 640 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)22 Ordibehesht 622the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die453,763days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-22,930,560,000seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-22,930,560,000,000
Relationship to the epoch265,400 days before the Unix epoch
Julian Day Number2,175,188midnight UTC
Days since 1 January 1900-239,833
Days since 1 January 2000-276,357
Moon phase
PhaseFull moonthe instant falls on this UTC day; in time zones far enough east or west the local date is a day either side
Illuminated at 12:00 UTC100%≈to about 1%, by Meeus
Waxing or waningWaxing
Moon age at 12:00 UTC14.8 dayssince the previous new moon
Previous new moon27 April 1243
Next new moon27 May 1243
This full moon12 May 1243
Next full moon11 June 1243
PrecisionDates onlybefore 1700 or after 2150 the Earth's rotation is not known well enough to give a time, and a phase near midnight can land a day either side
Relative to today
These values depend on today’s date and change daily.
Today18 September 2026
Days ago286,114 days
In other terms783 years, 123 days and 6 hours
Weeks40873.4 weeks ago
Anniversary this year129 days ago
Years elapsed783 complete years
Seasons & signs
Zodiac signTaurusEarth sign
Chinese zodiac yearRabbitthe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Springmeteorological seasons, by whole months
Season (Southern Hemisphere)Autumn
Easter Sunday that year19 April 1243
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