Recognised as Date
18 May 1620
- Monday
- Q2
- Leap year
- Week 21
- Taurus
18 May 1620 falls on a Monday. It is day 139 of 366 in 1620, a leap year, falling in week 21 and quarter 2. Its Unix timestamp is -11,033,020,800.
Calendar position
Day of the weekMonday
Day of the month18th
Day of the year139 of 366
Days remaining in the year227
Days elapsed in the year138
ISO week numberWeek 21ISO 8601, weeks start on Monday
Week of the month3rd
Occurrence in the month3rd Monday
MonthMay (month 5 of 12)
QuarterQ2 1620
Year1620
Days in the month31
Leap yearYes, 366 days
This date in other formats
ISO 86011620-05-18
British (D/M/Y)18/05/1620
American (M/D/Y)05/18/1620
Long formMonday 18th May 1620
RFC 2822Mon, 18 May 1620 00:00:00 GMT
Compact16200518
In wordsthe 18th of May, one thousand, six hundred and twenty
This date in other calendars
Hebrew15 Iyyar 5380the Hebrew calendar has been fully algorithmic since the ninth century, so this is exact
Islamic (tabular)15 Jumada II 1029 AHthe tabular reckoning; the calendar in religious use begins each month on an actual crescent sighting, so expect a day either way
Persian (arithmetic)29 Ordibehesht 999the arithmetic (Birashk) calendar; the official Solar Hijri calendar takes its new year from the astronomical equinox at Tehran
Rata Die591,466days since 1 January 1 CE in the proleptic Gregorian calendar, the pivot every conversion here runs through
Unix time & day counts
Unix timestamp-11,033,020,800seconds since 1 January 1970, midnight UTC
Unix timestamp (ms)-11,033,020,800,000
Relationship to the epoch127,697 days before the Unix epoch
Julian Day Number2,312,891midnight UTC
Days since 1 January 1900-102,130
Days since 1 January 2000-138,654
Moon phase
PhaseWaning gibbousthe same phase everywhere on Earth at the same instant
Illuminated at 12:00 UTC96%≈to about 1%, by Meeus
Waxing or waningWaning
Moon age at 12:00 UTC16 dayssince the previous new moon
Previous new moon2 May 1620
Next new moon31 May 1620
Previous full moon16 May 1620
Next full moon15 June 1620
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.
Today22 September 2026
Days ago148,415 days
In other terms406 years, 123 days and 12 hours
Weeks21202.1 weeks ago
Anniversary this year127 days ago
Years elapsed406 complete years
Seasons & signs
Zodiac signTaurusEarth sign
Chinese zodiac yearMonkeythe animal changes at Chinese New Year, not 1 January
Season (Northern Hemisphere)Springmeteorological seasons, by whole months
Season (Southern Hemisphere)Autumn
Easter Sunday that year19 April 1620
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