When?
- red-letter day
- a memorably happy or noteworthy day (from the custom of marking holy days in red on church calendars)
- Siwan
- the ninth month of the civil year; the third month of the ecclesiastical year in the Jewish calendar (in May and June)
- Transfiguration Day
- (Christianity) a church festival held in commemoration of the Transfiguration of Jesus
- time
- an indefinite period (usually marked by specific attributes or activities)
- off-season
- the season when travel is least active and rates are lowest
- Tishri
- the first month of the civil year; the seventh month of the ecclesiastical year in the Jewish calendar (in September and October)
- academic session
- the time during which a school holds classes
- probation
- a trial period during which your character and abilities are tested to see whether you are suitable for work or for membership
- sixties
- the time of life between 60 and 70
- Eolithic Age
- the earliest part of the Stone Age marked by the earliest signs of human culture
- sesquicentennial
- the 150th anniversary (or the celebration of it)
- Platonic year
- time required for one complete cycle of the precession of the equinoxes, about 25,800 years
- quarter-century
- a period of 25 years
- Golden Age
- (classical mythology) the first and best age of the world, a time of ideal happiness, prosperity, and innocence; by extension, any flourishing and outstanding period
- mid-July
- the middle part of July
- Whitsun Monday
- the day after Whitsunday; a legal holiday in England and Wales and Ireland
- nineties
- the decade from 1990 to 1999
- quatercentennial
- the 400th anniversary (or the celebration of it)
- Adar
- the sixth month of the civil year; the twelfth month of the ecclesiastic year in the Jewish calendar (in February and March)
- Robert E Lee's Birthday
- celebrated in southern United States
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