When?

Ninth of Ab
(Judaism) a major fast day on the Jewish calendar commemorating the destruction of the temples in Jerusalem
 
diamond jubilee
an anniversary celebrating the passage of 60 years
 
octave
a feast day and the seven days following it
 
shift
the time period during which you are at work
 
week
any period of seven consecutive days
 
Tuesday
the third day of the week; the second working day
 
semicentennial
the 50th anniversary (or the celebration of it)
 
Father's Day
US: third Sunday in June
 
basketball season
the season when basketball is played
 
extended time scale
(simulation) the time scale used in data processing when the time-scale factor is greater than one
 
Y2K
the year 2000 in the Gregorian calendar
 
January
the first month of the year; begins 10 days after the winter solstice
 
Margasivsa
the ninth month of the Hindu calendar
 
Michaelmas Day
honoring the archangel Michael; a quarter day in England, Wales, and Ireland
 
year of grace
any year of the Christian era
 
weeknight
any night of the week except Saturday or Sunday
 
Brumaire
second month of the Revolutionary calendar (October and November); the month of mist
 
minor fast day
one of five minor fast days on the Jewish calendar
 
Michaelmastide
the season of Michaelmas
 
sleep
a period of time spent sleeping
 
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