Recognised as Date
21 May 1058
- Friday
- Q2
- Common year
- Week 20
- Gemini
21 May 1058 falls on a Friday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 141 of 365 in 1058, falling in week 20 and quarter 2. Its Unix timestamp is -28,767,830,400.
Calendar position
Day of the weekFridayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month21st
Day of the year141 of 365
Days remaining in the year224
Days elapsed in the year140
ISO week numberWeek 20ISO 8601, weeks start on Monday
Week of the month3rd
Occurrence in the month3rd Friday
MonthMay (month 5 of 12)
QuarterQ2 1058
Year1058
Days in the month31
Leap yearNo, 365 days
This date in other formats
ISO 86011058-05-21
British (D/M/Y)21/05/1058
American (M/D/Y)05/21/1058
Long formFriday 21st May 1058
RFC 2822Fri, 21 May 1058 00:00:00 GMT
Compact10580521
In wordsthe 21st of May, one thousand and fifty-eight
Julian calendar equivalent15 May 1058the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew19 Iyyar 4818the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)18 Rabi I 450 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 437the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die386,202days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-28,767,830,400seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-28,767,830,400,000
Relationship to the epoch332,961 days before the Unix epoch
Julian Day Number2,107,627midnight UTC
Days since 1 January 1900-307,394
Days since 1 January 2000-343,918
Moon phase
PhaseWaning gibbousthe same phase everywhere on Earth at the same instant
Illuminated at 12:00 UTC74%≈to about 1%, by Meeus
Waxing or waningWaning
Moon age at 12:00 UTC19.9 dayssince the previous new moon
Previous new moon1 May 1058
Next new moon31 May 1058
Previous full moon16 May 1058
Next full moon15 June 1058
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.
Today22 September 2026
Days ago353,679 days
In other terms968 years and 117 days
Weeks50525.6 weeks ago
Anniversary this year124 days ago
Years elapsed968 complete years
Seasons & signs
Zodiac signGeminiAir sign
Chinese zodiac yearDogthe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Springmeteorological seasons, by whole months
Season (Southern Hemisphere)Autumn
Easter Sunday that year18 April 1058
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