Recognised as Date
1 September 1423
- Monday
- Q3
- Common year
- Week 36
- Virgo
1 September 1423 falls on a Monday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 244 of 365 in 1423, falling in week 36 and quarter 3. Its Unix timestamp is -17,240,688,000.
Calendar position
Day of the weekMondayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month1st
Day of the year244 of 365
Days remaining in the year121
Days elapsed in the year243
ISO week numberWeek 36ISO 8601, weeks start on Monday
Week of the month1st
Occurrence in the month1st Monday
QuarterQ3 1423
Year1423
Days in the month30
Leap yearNo, 365 days
This date in other formats
ISO 86011423-09-01
British (D/M/Y)01/09/1423
American (M/D/Y)09/01/1423
Long formMonday 1st September 1423
RFC 2822Mon, 01 Sep 1423 00:00:00 GMT
Compact14230901
In wordsthe 1st of September, one thousand, four hundred and twenty-three
Julian calendar equivalent23 August 1423the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew16 Elul 5183the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)16 Ramadan 826 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)9 Shahrivar 802the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die519,618days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-17,240,688,000seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-17,240,688,000,000
Relationship to the epoch199,545 days before the Unix epoch
Julian Day Number2,241,043midnight UTC
Days since 1 January 1900-173,978
Days since 1 January 2000-210,502
Moon phase
PhaseWaning gibbousthe same phase everywhere on Earth at the same instant
Illuminated at 12:00 UTC97%≈to about 1%, by Meeus
Waxing or waningWaning
Moon age at 12:00 UTC17 dayssince the previous new moon
Previous new moon15 August 1423
Next new moon14 September 1423
Previous full moon30 August 1423
Next full moon29 September 1423
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.
Today18 September 2026
Days ago220,259 days
In other terms603 years, 13 days and 6 hours
Weeks31465.6 weeks ago
Anniversary this year17 days ago
Years elapsed603 complete years
Seasons & signs
Zodiac signVirgoEarth sign
Chinese zodiac yearRabbitthe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Autumnmeteorological seasons, by whole months
Season (Southern Hemisphere)Spring
Easter Sunday that year6 April 1423
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