Recognised as Date
20 August 1055
- Monday
- Q3
- Common year
- Week 34
- Leo
20 August 1055 falls on a Monday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 232 of 365 in 1055, falling in week 34 and quarter 3. Its Unix timestamp is -28,854,662,400.
Calendar position
Day of the weekMondayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month20th
Day of the year232 of 365
Days remaining in the year133
Days elapsed in the year231
ISO week numberWeek 34ISO 8601, weeks start on Monday
Week of the month3rd
Occurrence in the month3rd Monday
QuarterQ3 1055
Year1055
Days in the month31
Leap yearNo, 365 days
This date in other formats
ISO 86011055-08-20
British (D/M/Y)20/08/1055
American (M/D/Y)08/20/1055
Long formMonday 20th August 1055
RFC 2822Mon, 20 Aug 1055 00:00:00 GMT
Compact10550820
In wordsthe 20th of August, one thousand and fifty-five
Julian calendar equivalent14 August 1055the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew18 Av 4815the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)17 Jumada I 447 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 Mordad 434the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die385,197days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-28,854,662,400seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-28,854,662,400,000
Relationship to the epoch333,966 days before the Unix epoch
Julian Day Number2,106,622midnight UTC
Days since 1 January 1900-308,399
Days since 1 January 2000-344,923
Moon phase
PhaseWaning gibbousthe same phase everywhere on Earth at the same instant
Illuminated at 12:00 UTC84%≈to about 1%, by Meeus
Waxing or waningWaning
Moon age at 12:00 UTC18.6 dayssince the previous new moon
Previous new moon1 August 1055
Next new moon31 August 1055
Previous full moon16 August 1055
Next full moon14 September 1055
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 ago354,717 days
In other terms971 years, 59 days and 6 hours
Weeks50673.9 weeks ago
Anniversary this year66 days ago
Years elapsed971 complete years
Seasons & signs
Zodiac signLeoFire sign
Chinese zodiac yearGoatthe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Summermeteorological seasons, by whole months
Season (Southern Hemisphere)Winter
Easter Sunday that year25 March 1055
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