Recognised as Date
21 May 1048
- Sunday
- Q2
- Leap year
- Week 20
- Gemini
21 May 1048 falls on a Sunday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 142 of 366 in 1048, a leap year, falling in week 20 and quarter 2. Its Unix timestamp is -29,083,363,200. A new moon falls on this day.
Calendar position
Day of the weekSundayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month21st
Day of the year142 of 366
Days remaining in the year224
Days elapsed in the year141
ISO week numberWeek 20ISO 8601, weeks start on Monday
Week of the month3rd
Occurrence in the month3rd Sunday
MonthMay (month 5 of 12)
QuarterQ2 1048
Year1048
Days in the month31
Leap yearYes, 366 days
This date in other formats
ISO 86011048-05-21
British (D/M/Y)21/05/1048
American (M/D/Y)05/21/1048
Long formSunday 21st May 1048
RFC 2822Sun, 21 May 1048 00:00:00 GMT
Compact10480521
In wordsthe 21st of May, one thousand and forty-eight
Julian calendar equivalent15 May 1048the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew28 Iyyar 4808the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)28 Dhu al-Qidah 439 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)31 Ordibehesht 427the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die382,550days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-29,083,363,200seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-29,083,363,200,000
Relationship to the epoch336,613 days before the Unix epoch
Julian Day Number2,103,975midnight UTC
Days since 1 January 1900-311,046
Days since 1 January 2000-347,570
Moon phase
PhaseNew moonthe instant falls on this UTC day; in time zones far enough east or west the local date is a day either side
Illuminated at 12:00 UTC0%≈to about 1%, by Meeus
Waxing or waningWaning
Moon age at 12:00 UTC29.5 dayssince the previous new moon
This new moon21 May 1048
Next new moon20 June 1048
Previous full moon7 May 1048
Next full moon5 June 1048
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.
Today19 September 2026
Days ago357,328 days
In other terms978 years, 113 days and 12 hours
Weeks51046.9 weeks ago
Anniversary this year121 days ago
Years elapsed978 complete years
Seasons & signs
Zodiac signGeminiAir sign
Chinese zodiac yearRatthe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Springmeteorological seasons, by whole months
Season (Southern Hemisphere)Autumn
Easter Sunday that year9 April 1048
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