When?

Chislev
the third month of the civil year; the ninth month of the ecclesiastical year in the Jewish calendar (in November and December)
 
Allhallows Eve
the evening before All Saints' Day; often devoted to pranks played by young people
 
full phase of the moon
the time when the Moon is fully illuminated
 
Saints Peter and Paul
first celebrated in the 3rd century
 
day
the recurring hours when you are not sleeping (especially those when you are working)
 
Ventose
sixth month of the Revolutionary calendar (February and March); the windy month
 
Midsummer Night
the night before Midsummer Day
 
Jefferson Davis' Birthday
celebrated in southern United States
 
millenary
the 1000th anniversary (or the celebration of it)
 
Jewish holy day
a religious holiday for Jews
 
Thursday
the fifth day of the week; the fourth working day
 
Paleolithic Age
second part of the Stone Age beginning about 750,000 to 500,000 years BC and lasting until the end of the last ice age about 8,500 years BC
 
duration
the period of time during which something continues
 
half-term
a short vacation about halfway through a school term
 
fertile period
the time in the menstrual cycle when fertilization is most likely to be possible (7 days before to 7 days after ovulation)
 
October
the month following September and preceding November
 
hours
a period of time assigned for work
 
usance
the period of time permitted by commercial usage for the payment of a bill of exchange (especially a foreign bill of exchange)
 
honeymoon
a holiday taken by a newly married couple
 
exhibition season
the time before the regular games begin when football or baseball teams play practice games
 
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