Recognised as Date
18 May 1175
- Sunday
- Q2
- Common year
- Week 20
- Taurus
18 May 1175 falls on a Sunday in the proleptic Gregorian calendar, which did not yet exist at the time. It is day 138 of 365 in 1175, falling in week 20 and quarter 2. Its Unix timestamp is -25,075,958,400.
Calendar position
Day of the weekSundayproleptic Gregorian; contemporaries used the Julian calendar and would have named a different day
Day of the month18th
Day of the year138 of 365
Days remaining in the year227
Days elapsed in the year137
ISO week numberWeek 20ISO 8601, weeks start on Monday
Week of the month3rd
Occurrence in the month3rd Sunday
MonthMay (month 5 of 12)
QuarterQ2 1175
Year1175
Days in the month31
Leap yearNo, 365 days
This date in other formats
ISO 86011175-05-18
British (D/M/Y)18/05/1175
American (M/D/Y)05/18/1175
Long formSunday 18th May 1175
RFC 2822Sun, 18 May 1175 00:00:00 GMT
Compact11750518
In wordsthe 18th of May, one thousand, one hundred and seventy-five
Julian calendar equivalent11 May 1175the date contemporaries would have written, before the Gregorian calendar existed
This date in other calendars
Hebrew18 Iyyar 4935the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)17 Shawwal 570 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)27 Ordibehesht 554the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die428,932days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-25,075,958,400seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-25,075,958,400,000
Relationship to the epoch290,231 days before the Unix epoch
Julian Day Number2,150,357midnight UTC
Days since 1 January 1900-264,664
Days since 1 January 2000-301,188
Moon phase
PhaseWaning gibbousthe same phase everywhere on Earth at the same instant
Illuminated at 12:00 UTC86%≈to about 1%, by Meeus
Waxing or waningWaning
Moon age at 12:00 UTC19 dayssince the previous new moon
Previous new moon29 April 1175
Next new moon28 May 1175
Previous full moon14 May 1175
Next full moon13 June 1175
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.
Today21 September 2026
Days ago310,948 days
In other terms851 years, 120 days and 6 hours
Weeks44421.1 weeks ago
Anniversary this year126 days ago
Years elapsed851 complete years
Seasons & signs
Zodiac signTaurusEarth sign
Chinese zodiac yearGoatthe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Springmeteorological seasons, by whole months
Season (Southern Hemisphere)Autumn
Easter Sunday that year20 April 1175
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