When?
- April
- the month following March and preceding May
- Iyyar
- the eighth month of the civil year; the second month of the ecclesiastical year (in April and May)
- mid-January
- the middle part of January
- 1780s
- the decade from 1780 to 1789
- Nissan
- the seventh month of the civil year; the first month of the ecclesiastic year (in March and April)
- silver jubilee
- an anniversary celebrating the passage of 25 years
- uptime
- a period of time when something (as a machine or factory) is functioning and available for use
- February 29
- the name of the day that is added during a leap year
- turn of the century
- the period from about ten years before to ten years after a new century
- Commonwealth Day
- British, anniversary of Queen Victoria's birth
- Thanksgiving Day
- fourth Thursday in November in the United States; second Monday in October in Canada; commemorates a feast held in 1621 by the Pilgrims and the Wampanoag
- year
- the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun
- Feast of Dormition
- celebration in the Eastern Orthodox Church of the Virgin Mary's being taken up into heaven when her earthly life ended; corresponds to the Assumption in the Roman Catholic Church and is also celebrated on August 15th
- Harlem Renaissance
- a period in the 1920s when African-American achievements in art and music and literature flourished
- eventide
- the latter part of the day (the period of decreasing daylight from late afternoon until nightfall)
- run
- the continuous period of time during which something (a machine or a factory) operates or continues in operation
- incubation period
- the period between infection and the appearance of symptoms of the disease
- semester
- one of two divisions of an academic year
- Stone Age
- (archeology) the earliest known period of human culture, characterized by the use of stone implements
- jubilee
- a special anniversary (or the celebration of it)
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