Recognised as Date
13 September 1440
- Sunday
- Q3
- Leap year
- Week 37
- Virgo
13 September 1440 falls on a Sunday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 257 of 366 in 1440, a leap year, falling in week 37 and quarter 3. Its Unix timestamp is -16,703,107,200.
Calendar position
Day of the weekSundayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month13th
Day of the year257 of 366
Days remaining in the year109
Days elapsed in the year256
ISO week numberWeek 37ISO 8601, weeks start on Monday
Week of the month2nd
Occurrence in the month2nd Sunday
QuarterQ3 1440
Year1440
Days in the month30
Leap yearYes, 366 days
This date in other formats
ISO 86011440-09-13
British (D/M/Y)13/09/1440
American (M/D/Y)09/13/1440
Long formSunday 13th September 1440
RFC 2822Sun, 13 Sep 1440 00:00:00 GMT
Compact14400913
In wordsthe 13th of September, one thousand, four hundred and forty
Julian calendar equivalent4 September 1440the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew7 Tishri 5201the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)6 Rabi II 844 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)22 Shahrivar 819the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die525,840days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-16,703,107,200seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-16,703,107,200,000
Relationship to the epoch193,323 days before the Unix epoch
Julian Day Number2,247,265midnight UTC
Days since 1 January 1900-167,756
Days since 1 January 2000-204,280
Relative to today
These values depend on today’s date and change daily.
Today16 September 2026
Days ago214,035 days
In other terms585 years, 363 days and 18 hours
Weeks30576.4 weeks ago
Anniversary this year3 days ago
Years elapsed586 complete years
Seasons & signs
Zodiac signVirgoEarth sign
Chinese zodiac yearMonkeythe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Autumnmeteorological seasons, by whole months
Season (Southern Hemisphere)Spring
Easter Sunday that year29 March 1440
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