Recognised as Date
31 January 1012
- Friday
- Q1
- Leap year
- Week 5
- Aquarius
31 January 1012 falls on a Friday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 31 of 366 in 1012, a leap year, falling in week 5 and quarter 1. Its Unix timestamp is -30,229,027,200.
Calendar position
Day of the weekFridayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month31st
Day of the year31 of 366
Days remaining in the year335
Days elapsed in the year30
ISO week numberWeek 5ISO 8601, weeks start on Monday
Week of the month5th
Occurrence in the month5th Friday, and the last of the month
QuarterQ1 1012
Year1012
Days in the month31
Leap yearYes, 366 days
This date in other formats
ISO 86011012-01-31
British (D/M/Y)31/01/1012
American (M/D/Y)01/31/1012
Long formFriday 31st January 1012
RFC 2822Fri, 31 Jan 1012 00:00:00 GMT
Compact10120131
In wordsthe 31st of January, one thousand and twelve
Julian calendar equivalent25 January 1012the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew28 Shevat 4772the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)27 Jumada II 402 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)10 Bahman 390the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die369,290days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-30,229,027,200seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-30,229,027,200,000
Relationship to the epoch349,873 days before the Unix epoch
Julian Day Number2,090,715midnight UTC
Days since 1 January 1900-324,306
Days since 1 January 2000-360,830
Moon phase
PhaseWaning crescentthe same phase everywhere on Earth at the same instant
Illuminated at 12:00 UTC0%≈to about 1%, by Meeus
Waxing or waningWaning
Moon age at 12:00 UTC29.1 dayssince the previous new moon
Previous new moon2 January 1012
Next new moon1 February 1012
Previous full moon18 January 1012
Next full moon16 February 1012
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 ago370,587 days
In other terms1,014 years, 223 days and 12 hours
Weeks52941.0 weeks ago
Anniversary this year230 days ago
Years elapsed1,014 complete years
Seasons & signs
Zodiac signAquariusAir sign
Chinese zodiac yearRatthe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Wintermeteorological seasons, by whole months
Season (Southern Hemisphere)Summer
Easter Sunday that year19 April 1012
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