Recognised as Date
21 August 1066
- Tuesday
- Q3
- Common year
- Week 34
- Leo
21 August 1066 falls on a Tuesday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 233 of 365 in 1066, falling in week 34 and quarter 3. Its Unix timestamp is -28,507,420,800. A last quarter falls on this day.
Calendar position
Day of the weekTuesdayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month21st
Day of the year233 of 365
Days remaining in the year132
Days elapsed in the year232
ISO week numberWeek 34ISO 8601, weeks start on Monday
Week of the month3rd
Occurrence in the month3rd Tuesday
QuarterQ3 1066
Year1066
Days in the month31
Leap yearNo, 365 days
This date in other formats
ISO 86011066-08-21
British (D/M/Y)21/08/1066
American (M/D/Y)08/21/1066
Long formTuesday 21st August 1066
RFC 2822Tue, 21 Aug 1066 00:00:00 GMT
Compact10660821
In wordsthe 21st of August, one thousand and sixty-six
Julian calendar equivalent15 August 1066the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew21 Av 4826the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)20 Ramadan 458 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)30 Mordad 445the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die389,216days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-28,507,420,800seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-28,507,420,800,000
Relationship to the epoch329,947 days before the Unix epoch
Julian Day Number2,110,641midnight UTC
Days since 1 January 1900-304,380
Days since 1 January 2000-340,904
Moon phase
PhaseLast quarterthe 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 UTC51%≈to about 1%, by Meeus
Waxing or waningWaning
Moon age at 12:00 UTC21.4 dayssince the previous new moon
Previous new moon31 July 1066
Next new moon29 August 1066
Previous full moon14 August 1066
Next full moon12 September 1066
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.
Today25 October 2026
Days ago350,698 days
In other terms960 years and 58 days
Weeks50099.7 weeks ago
Anniversary this year65 days ago
Years elapsed960 complete years
Seasons & signs
Zodiac signLeoFire sign
Chinese zodiac yearHorsethe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Summermeteorological seasons, by whole months
Season (Southern Hemisphere)Winter
Easter Sunday that year22 April 1066
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