In/At/On For Time

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'