Recognised as Date
21 April 1378
- Tuesday
- Q2
- Common year
- Week 17
- Taurus
21 April 1378 falls on a Tuesday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 111 of 365 in 1378, falling in week 17 and quarter 2. Its Unix timestamp is -18,672,163,200. A full moon 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 year111 of 365
Days remaining in the year254
Days elapsed in the year110
ISO week numberWeek 17ISO 8601, weeks start on Monday
Week of the month3rd
Occurrence in the month3rd Tuesday
QuarterQ2 1378
Year1378
Days in the month30
Leap yearNo, 365 days
This date in other formats
ISO 86011378-04-21
British (D/M/Y)21/04/1378
American (M/D/Y)04/21/1378
Long formTuesday 21st April 1378
RFC 2822Tue, 21 Apr 1378 00:00:00 GMT
Compact13780421
In wordsthe 21st of April, one thousand, three hundred and seventy-eight
Julian calendar equivalent13 April 1378the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew15 Nisan 5138the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)14 Dhu al-Hijjah 779 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)1 Ordibehesht 757the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die503,050days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-18,672,163,200seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-18,672,163,200,000
Relationship to the epoch216,113 days before the Unix epoch
Julian Day Number2,224,475midnight UTC
Days since 1 January 1900-190,546
Days since 1 January 2000-227,070
Moon phase
PhaseFull 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 UTC100%≈to about 1%, by Meeus
Waxing or waningWaxing
Moon age at 12:00 UTC15.2 dayssince the previous new moon
Previous new moon6 April 1378
Next new moon5 May 1378
This full moon21 April 1378
Next full moon21 May 1378
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.
Today18 September 2026
Days ago236,827 days
In other terms648 years and 145 days
Weeks33832.4 weeks ago
Anniversary this year150 days ago
Years elapsed648 complete years
Seasons & signs
Zodiac signTaurusEarth sign
Chinese zodiac yearHorsethe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Springmeteorological seasons, by whole months
Season (Southern Hemisphere)Autumn
Easter Sunday that year29 March 1378
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