At, in, on for Time

At

Use at for specific times.

Examples:

at 4 o’clock

at 7:15

at night

at noon

 

In

Use in when you want to talk about a longer period.

Examples:

in the winter

in 1999

in the morning

in September

 

On

Use on when you’re talking about a certain day.

on Friday

on Wednesday afternoon

on Saturday night

on New Year’s Eve

 

In time vs. on time

On time means exactly at the time that you said.

Example:

The meeting is at 2 pm. Please come on time.

In time means until a certain deadline.

Example:

We had 2 hours for the exam. Most students were able to finish in time.