When?

compensatory time
time off that is granted to a worker as compensation for working overtime
 
thirties
the time of life between 30 and 40
 
Michaelmastide
the season of Michaelmas
 
trimester
one of three divisions of an academic year
 
Feast of the Circumcision
(Roman Catholic Church and Anglican Church) feast day celebrating the circumcision of Jesus; celebrated on January 1st
 
mid-November
the middle part of November
 
1950s
the decade from 1950 to 1959
 
April Fools' day
the first day of April which is celebrated by playing practical jokes
 
Caliphate
the era of Islam's ascendancy from the death of Mohammed until the 13th century; some Moslems still maintain that the Moslem world must always have a calif as head of the community
 
decennium
a period of 10 years
 
phase of the moon
a time when the Moon presents a particular recurring appearance
 
Fast of Esther
(Judaism) a minor fast day on Adar 13 commemorates three days that Esther fasted before approaching the Persian king on behalf of the Jewish people; the fast is connected with Purim
 
turn
a time period for working (after which you will be relieved by someone else)
 
Allhallowtide
the season of All Saints' Day
 
calendar year
the year (reckoned from January 1 to December 31) according to Gregorian calendar
 
Germinal
seventh month of the Revolutionary calendar (March and April); the month of buds
 
term
a limited period of time
 
Michaelmas Day
honoring the archangel Michael; a quarter day in England, Wales, and Ireland
 
church festival
a festival having religious significance
 
Thammuz
the tenth month of the civil year; the fourth month of the ecclesiastic year (in June and July)
 
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