Recognised as Date
31 May 1306
- Monday
- Q2
- Common year
- Week 22
- Gemini
31 May 1306 falls on a Monday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 151 of 365 in 1306, falling in week 22 and quarter 2. Its Unix timestamp is -20,940,854,400.
Calendar position
Day of the weekMondayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
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 Monday, and the last of the month
MonthMay (month 5 of 12)
QuarterQ2 1306
Year1306
Days in the month31
Leap yearNo, 365 days
This date in other formats
ISO 86011306-05-31
British (D/M/Y)31/05/1306
American (M/D/Y)05/31/1306
Long formMonday 31st May 1306
RFC 2822Mon, 31 May 1306 00:00:00 GMT
Compact13060531
In wordsthe 31st of May, one thousand, three hundred and six
Julian calendar equivalent23 May 1306the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew9 Sivan 5066the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)9 Dhu al-Qidah 705 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 685the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die476,792days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-20,940,854,400seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-20,940,854,400,000
Relationship to the epoch242,371 days before the Unix epoch
Julian Day Number2,198,217midnight UTC
Days since 1 January 1900-216,804
Days since 1 January 2000-253,328
Moon phase
PhaseWaxing gibbousthe same phase everywhere on Earth at the same instant
Illuminated at 12:00 UTC69%≈to about 1%, by Meeus
Waxing or waningWaxing
Moon age at 12:00 UTC10.1 dayssince the previous new moon
Previous new moon21 May 1306
Next new moon19 June 1306
Previous full moon7 May 1306
Next full moon5 June 1306
Lit side, Northern HemisphereRight
Lit side, Southern HemisphereLeftthe 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.
Today20 September 2026
Days ago263,087 days
In other terms720 years and 107 days
Weeks37583.9 weeks ago
Anniversary this year112 days ago
Years elapsed720 complete years
Seasons & signs
Zodiac signGeminiAir sign
Chinese zodiac yearHorsethe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Springmeteorological seasons, by whole months
Season (Southern Hemisphere)Autumn
Easter Sunday that year11 April 1306
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