When?

calendar year
the year (reckoned from January 1 to December 31) according to Gregorian calendar
 
Nivose
fourth month of the Revolutionary calendar (December and January); the snowy month
 
Walpurgis Night
eve of May Day
 
prophase
the first stage of meiosis
 
night
the period spent sleeping
 
half-century
a period of 50 years
 
diamond wedding anniversary
the 60th wedding anniversary
 
Reign of Terror
the historic period (1793-94) during the French Revolution when thousands were executed
 
regency
the period of time during which a regent governs
 
life
the period between birth and the present time
 
Groundhog Day
if the ground hog emerges and sees his shadow on this day, there will be 6 more weeks of winter
 
Lammastide
the season of Lammas
 
calendar day
a day reckoned from midnight to midnight
 
kingdom come
the next world
 
Armed Forces Day
the 3rd Saturday in May
 
Pascha
the Jewish feast of the Passover
 
mid-May
the middle part of May
 
Fast of Tammuz
(Judaism) a minor fast day on Tammuz 17 when the walls of Jerusalem were breached
 
past
a earlier period in someone's life (especially one that they have reason to keep secret)
 
novitiate
the period during which you are a novice (especially in a religious order)
 
  List More