When?

Floreal
eighth month of the Revolutionary calendar (April and May); the month of flowers
 
market day
a fixed day for holding a public market
 
fertile period
the time in the menstrual cycle when fertilization is most likely to be possible (7 days before to 7 days after ovulation)
 
peacetime
a period of time during which there is no war
 
month
one of the twelve divisions of the calendar year
 
bimillennium
the 2000th anniversary (or the celebration of it)
 
Margasivsa
the ninth month of the Hindu calendar
 
teens
the time of life between the ages of 12 and 20
 
Rajab
the seventh month of the Islamic calendar
 
adolescence
the time period between the beginning of puberty and adulthood
 
snap
a spell of cold weather
 
New Year's Day
the first day of the year
 
football season
the season when football is played
 
Olympiad
one of the four-year intervals between Olympic Games; used to reckon time in ancient Greece for twelve centuries beginning in 776 BC
 
Frimaire
third month of the Revolutionary calendar (November and December); the frosty month
 
full
the time when the Moon is fully illuminated
 
Independence Day
a legal holiday in the United States
 
1840s
the decade from 1840 to 1849
 
mid-fifties
the time of life between 50 and 60
 
Rabi II
the fourth month of the Islamic calendar
 
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