When?

watch
the period during which someone (especially a guard) is on duty
 
United Nations Day
a day for celebrating the founding of the United Nations
 
date of reference
(astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
 
telophase
the final stage of mitosis
 
fifties
the time of life between 50 and 60
 
Shrove Tuesday
the last day before Lent
 
payday
the day on which you receive pay for your work
 
compassionate leave
(military) leave granted in an emergency such as family sickness or death
 
harvest
the season for gathering crops
 
second trimester
time period extending from the 13th to the 27th week of gestation
 
mid-February
the middle part of February
 
fast day
a day designated for fasting
 
Holy Innocents' Day
December 28, commemorating Herod's slaughter of the children of Bethlehem
 
Father's Day
US: third Sunday in June
 
Heshvan
the second month of the civil year; the eighth month of the ecclesiastical year in the Jewish calendar (in October and November)
 
Feast of Sacrifice
the 10th day of Dhu'l-Hijja; all Muslims attend a service in the mosques and those who are not pilgrims perform a ritual slaughter of a sheep (commemorating God's ransom of Abraham's son from sacrifice) and give at least a third of the meat to charity
 
grace period
a period of time past the deadline for fulfilling an obligation during which a penalty that would be imposed for being late is waived, especially an extended period granted as a special favor
 
Purim
(Judaism) a Jewish holy day commemorating their deliverance from massacre by Haman
 
Victorian age
a period in British history during the reign of Queen Victoria in the 19th century; her character and moral standards restored the prestige of the British monarchy but gave the era a prudish reputation
 
boyhood
the childhood of a boy
 
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