Recognised as Date
18 May 2031
- Sunday
- Q2
- Common year
- Week 20
- Taurus
18 May 2031 falls on a Sunday. It is day 138 of 365 in 2031, falling in week 20 and quarter 2. Its Unix timestamp is 1,936,828,800.
Calendar position
Day of the weekSunday
Day of the month18th
Day of the year138 of 365
Days remaining in the year227
Days elapsed in the year137
ISO week numberWeek 20ISO 8601, weeks start on Monday
Week of the month3rd
Occurrence in the month3rd Sunday
MonthMay (month 5 of 12)
QuarterQ2 2031
Year2031
Days in the month31
Leap yearNo, 365 days
This date in other formats
ISO 86012031-05-18
British (D/M/Y)18/05/2031
American (M/D/Y)05/18/2031
Long formSunday 18th May 2031
RFC 2822Sun, 18 May 2031 00:00:00 GMT
Compact20310518
In wordsthe 18th of May, two thousand and thirty-one
This date in other calendars
Hebrew25 Iyyar 5791the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)26 Muharram 1453 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)28 Ordibehesht 1410the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die741,580days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp1,936,828,800seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)1,936,828,800,000
Relationship to the epoch22,417 days after the Unix epoch
Julian Day Number2,463,005midnight UTC
Days since 1 January 190047,984
Days since 1 January 200011,460
Moon phase
PhaseWaning crescentthe same phase everywhere on Earth at the same instant
Illuminated at 12:00 UTC8%≈to about 1%, by Meeus
Waxing or waningWaning
Moon age at 12:00 UTC26.8 dayssince the previous new moon
Previous new moon21 April 2031, 16:57 UTC
Next new moon21 May 2031, 07:17 UTC
Previous full moon7 May 2031, 03:40 UTC
Next full moon5 June 2031, 11:58 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.
Today21 September 2026
Days from today1,700 days
In other terms4 years and 239 days
Weeks242.9 weeks from now
Anniversary this year126 days ago
Years elapsed5 years in the future
Seasons & signs
Zodiac signTaurusEarth 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 year13 April 2031
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