Recognised as Date
1 January 1101
- Tuesday
- Q1
- Common year
- Week 1
- Capricorn
1 January 1101 falls on a Tuesday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 1 of 365 in 1101, falling in week 1 and quarter 1. Its Unix timestamp is -27,423,014,400.
Calendar position
Day of the weekTuesdayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month1st
Day of the year1 of 365
Days remaining in the year364
Days elapsed in the year0
ISO week numberWeek 1ISO 8601, weeks start on Monday
Week of the month1st
Occurrence in the month1st Tuesday
QuarterQ1 1101
Year1101
Days in the month31
Leap yearNo, 365 days
This date in other formats
ISO 86011101-01-01
British (D/M/Y)01/01/1101
American (M/D/Y)01/01/1101
Long formTuesday 1st January 1101
RFC 2822Tue, 01 Jan 1101 00:00:00 GMT
Compact11010101
In wordsthe 1st of January, one thousand, one hundred and one
Julian calendar equivalent25 December 1100the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew22 Tevet 4861the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)20 Safar 494 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)11 Dey 479the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die401,767days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-27,423,014,400seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-27,423,014,400,000
Relationship to the epoch317,396 days before the Unix epoch
Julian Day Number2,123,192midnight UTC
Days since 1 January 1900-291,829
Days since 1 January 2000-328,353
Relative to today
These values depend on today’s date and change daily.
Today17 September 2026
Days ago338,109 days
In other terms925 years, 252 days and 18 hours
Weeks48301.3 weeks ago
Anniversary this year259 days ago
Years elapsed925 complete years
Seasons & signs
Zodiac signCapricornEarth sign
Chinese zodiac yearSnakethe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Wintermeteorological seasons, by whole months
Season (Southern Hemisphere)Summer
Easter Sunday that year24 March 1101
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Adjacent days
The same day in other years
Nerdulate something else
Nothing in mind? Surprise me · today’s page