Form
Used to specify when something happens.
(From general [in] to specific [at])
I was born in 1990.
The meeting is on Friday.
Let’s meet at 3 PM.
Meanings
A simple way to remember `in`, `on`, `at` for time.
- IN (Largest Periods)
- Centuries, Decades, Years, Seasons, Months
- e.g., in the 21st century, in the 80s, in 2025, in summer, in July
- ON (More Specific)
- Days and Dates
- e.g., on Sunday, on my birthday, on April 1st
- AT (Most Specific)
- Times, Festivals, Specific Moments
- e.g., at 9:00 AM, at midnight, at Christmas, at the moment