When?

day of the week
any one of the seven days in a week
 
Italian Renaissance
the early period when Italy was the center of the Renaissance
 
week
any period of seven consecutive days
 
snap
a spell of cold weather
 
workweek
hours or days of work in a calendar week
 
Independence Day
a legal holiday in the United States
 
Siwan
the ninth month of the civil year; the third month of the ecclesiastical year in the Jewish calendar (in May and June)
 
clotting time
the time it takes for a sample of blood to clot; used to diagnose some clotting disorders
 
sheepshearing
the time or season when sheep are sheared
 
Rajab
the seventh month of the Islamic calendar
 
kingdom come
the next world
 
while
a period of indeterminate length (usually short) marked by some action or condition
 
1850s
the decade from 1850 to 1859
 
season
a recurrent time marked by major holidays
 
past
a earlier period in someone's life (especially one that they have reason to keep secret)
 
day shift
the work shift during the day (as 8 a.m. to 4 p.m.)
 
Y2K
the year 2000 in the Gregorian calendar
 
diamond wedding
the 60th wedding anniversary
 
continuance
the period of time during which something continues
 
field day
a day for outdoor athletic competition
 
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