PREPOSITIONS OF TIME

PREPOSITIONS OF TIME

AT		ON
We use at with times:		We use on with dates and days:
at 5 o’clock - at 11.45 - at midnight - at lunchtime		on 12 March - on Friday(s) - on Friday morning(s)
Tom usually gets up at 7 o’clock.		on Sunday afternoon(s) - on Saturday night(s)
		on Christmas Day (but at Christmas)
We use at in these expressions:
at night - at Christmas - at the moment / at present - at the same time - at weekends - at the age of...
IN		DURING
We use in for longer periods of time:		We use during + noun to say when something happens:
in April - in 1986 - in winter - in the 19th century - in the 1970s - in the morning(s) / in the afternoon(s) / in the evening(s)		during the film - during our holiday - during the night
In + period of time = a time in the future:		I fell asleep during the film.
Jack will be back in a week.		We met a lot of interesting peopleduring our holiday.
The train will leave in a few minutes.
In + how long it takes to do something:
I learned to drive in four weeks.
FOR		SINCE
We use for + a period of time:		We use since + a period of time:
for six years - for two hours - for a week		since April - since 1992 - since 8 o’ clock
I’ve lived in this house for six years. They have been watching TVfor two hours.		It has been raining since one o’ clock. They’ve known each othersince they were at school.
UNTIL		FROM - TO
We use until/till to say how long a situation continues:		We use from - to + beginning and end of a period:
Let’s wait until it stops raining. I stayed in bed until half past nine.		Last evening we watched TV from 5 to 8 o’ clock.

 http://www.english-4u.de/prepositionoftime.htm