Recognised as Date
31 May 1981
- Sunday
- Q2
- Common year
- Week 22
- Gemini
31 May 1981 falls on a Sunday. It is day 151 of 365 in 1981, falling in week 22 and quarter 2. Its Unix timestamp is 360,115,200.
Calendar position
Day of the weekSunday
Day of the month31st
Day of the year151 of 365
Days remaining in the year214
Days elapsed in the year150
ISO week numberWeek 22ISO 8601, weeks start on Monday
Week of the month5th
Occurrence in the month5th Sunday, and the last of the month
MonthMay (month 5 of 12)
QuarterQ2 1981
Year1981
Days in the month31
Leap yearNo, 365 days
This date in other formats
ISO 86011981-05-31
British (D/M/Y)31/05/1981
American (M/D/Y)05/31/1981
Long formSunday 31st May 1981
RFC 2822Sun, 31 May 1981 00:00:00 GMT
Compact19810531
In wordsthe 31st of May, one thousand, nine hundred and eighty-one
This date in other calendars
Hebrew27 Iyyar 5741the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)27 Rajab 1401 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 Khordad 1360the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die723,331days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp360,115,200seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)360,115,200,000
Relationship to the epoch4,168 days after the Unix epoch
Julian Day Number2,444,756midnight UTC
Days since 1 January 190029,735
Days since 1 January 2000-6,789
Moon phase
PhaseWaning crescentthe same phase everywhere on Earth at the same instant
Illuminated at 12:00 UTC6%≈to about 1%, by Meeus
Waxing or waningWaning
Moon age at 12:00 UTC27.3 dayssince the previous new moon
Previous new moon4 May 1981, 04:19 UTC
Next new moon2 June 1981, 11:32 UTC
Previous full moon19 May 1981, 00:04 UTC
Next full moon17 June 1981, 15:05 UTC
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
Relative to today
These values depend on today’s date and change daily.
Today18 September 2026
Days ago16,546 days
In other terms45 years, 109 days and 18 hours
Weeks2363.7 weeks ago
Anniversary this year110 days ago
Years elapsed45 complete years
Seasons & signs
Zodiac signGeminiAir sign
Chinese zodiac yearRoosterthe 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 1981
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