A date expressed as a real number of days counted with GMT noon on 1 January 4713 BC in proleptic Julian calendar (November 24, 4714 BC, in the proleptic Gregorian calendar) as zero; used primarily by astronomers and historians to compare events recorded in different cultures.

plural of day school

(simile) Quite clear.

A day that is believed to be safe for having unprotected sex without resulting in pregnancy, based on the woman's menstrual cycle.

A day set aside on a school calendar in certain climates, assuming a closure will occur during a given time period because of extreme weather conditions.

Alternative form of rest day

A type of fish or other seafood which has been caught and brought to market within more-or-less the last 24 hours.

(US, dated) Memorial Day

A holiday celebrated in Plymouth, Massachusetts, on December 22, to commemorate the landing of the Pilgrim Fathers in 1620.

7 January, the day after the feast of the Epiphany.