Grammar Basics · 3-minute read
In, on, or at for time?
Use in for months and years, on for days, and at for clock times.
The simple rule
Say in October, on Monday, and at 9 o’clock.
See the difference
✓ Say thisThe class starts at 9 a.m.
✕ Avoid thisThe class starts in 9 a.m.
Try it yourself
Say the correct example aloud, then create a sentence about your own life using the same pattern.