Prepositions of Time - In / At / On

Prepositions of Time - In / At / On
From Kenneth Beare

IN
Use 'in' months and years and periods of time:
in January
in 1978
in the twenties

Use 'in' a period of time in the future:
in a few weeks
in a couple of days

AT
Use 'at' with precise time:
at six o'clock
at 10.30
at two p.m.

ON
Use 'on' with days of the week:
on Monday
on Fridays

Use 'on' with specific calendar days:
on Christmas day
on October 22nd

IMPORTANT NOTES
in the morning / afternoon / evening - at night
We say in the morning, afternoon or evening BUT we say 'at night'