Recognised as Date
31 March 1011
- Sunday
- Q1
- Common year
- Week 13
- Aries
31 March 1011 falls on a Sunday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 90 of 365 in 1011, falling in week 13 and quarter 1. Its Unix timestamp is -30,255,465,600.
Calendar position
Day of the weekSundayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month31st
Day of the year90 of 365
Days remaining in the year275
Days elapsed in the year89
ISO week numberWeek 13ISO 8601, weeks start on Monday
Week of the month5th
Occurrence in the month5th Sunday, and the last of the month
QuarterQ1 1011
Year1011
Days in the month31
Leap yearNo, 365 days
This date in other formats
ISO 86011011-03-31
British (D/M/Y)31/03/1011
American (M/D/Y)03/31/1011
Long formSunday 31st March 1011
RFC 2822Sun, 31 Mar 1011 00:00:00 GMT
Compact10110331
In wordsthe 31st of March, one thousand and eleven
Julian calendar equivalent25 March 1011the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew18 Nisan 4771the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)16 Shaban 401 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 Farvardin 390the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die368,984days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-30,255,465,600seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-30,255,465,600,000
Relationship to the epoch350,179 days before the Unix epoch
Julian Day Number2,090,409midnight UTC
Days since 1 January 1900-324,612
Days since 1 January 2000-361,136
Moon phase
PhaseWaning gibbousthe same phase everywhere on Earth at the same instant
Illuminated at 12:00 UTC86%≈to about 1%, by Meeus
Waxing or waningWaning
Moon age at 12:00 UTC17.8 dayssince the previous new moon
Previous new moon13 March 1011
Next new moon12 April 1011
Previous full moon28 March 1011
Next full moon26 April 1011
Lit side, Northern HemisphereLeft
Lit side, Southern HemisphereRightthe same Moon seen from the other side of the equator; near the equator the lit side points up or down rather than to one side
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 ago370,893 days
In other terms1,015 years, 164 days and 6 hours
Weeks52984.7 weeks ago
Anniversary this year171 days ago
Years elapsed1,015 complete years
Seasons & signs
Zodiac signAriesFire 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 year31 March 1011
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