| at | in | on |
| PRECISE TIME | MONTHS, YEARS, CENTURIES and LONG PERIODS | DAYS and DATES |
| at 3 o'clock | in May | on Sunday |
| at 10.30am | in summer | on Tuesdays |
| at noon | in the summer | on 6 March |
| at dinnertime | in 1990 | on 25 Dec. 2010 |
| at bedtime | in the 1990s | on Christmas Day |
| at sunrise | in the next century | on Independence Day |
| at sunset | in the Ice Age | on my birthday |
| at the moment | in the past/future | on New Year's Eve |
