There are three main prepositions of time in English: at, on and in
1. We use at to talk about a specific time or age:
At six o’clock (6 a.m. / p.m.)
At midnight (12 a.m.)
At the age of 16
At quarter past three
At midday
2. We use on to talk about a specific day or date:
On the 25th December
On the 16th May
On Sunday mornings
On Monday
3. We use in to talk about a period of time:
In spring / summer / autumn / winter
In January / February
In the morning / the afternoon, the evening (BUT, at night)
In 1990, 2001 etc.
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