Read clocks, convert times and calculate durations!
| Time | Minutes past | Example |
|---|---|---|
| o'clock | 0 minutes past | 3:00 |
| quarter past | 15 minutes past | 3:15 |
| half past | 30 minutes past | 3:30 |
| quarter to | 45 minutes past (15 to next hour) | 3:45 |
The minute hand points to numbers 1–12. Each number = 5 minutes.
am = morning (midnight to noon) | pm = afternoon/evening (noon to midnight)
Examples: 9:30 am = morning | 3:45 pm = afternoon
Uses 4 digits: HHMM. No am/pm needed.
| 12-hour | 24-hour |
|---|---|
| 9:00 am | 0900 |
| 12:00 pm (noon) | 1200 |
| 3:30 pm | 1530 (add 12 to pm hours after 12) |
| midnight | 0000 |
Count the minutes (or hours) between a start and end time.
Example: 9:15 → 10:00 = 45 minutes
Tip: count up to the next hour first, then add the remaining time.
| Fact | Value |
|---|---|
| Days in a week | 7 |
| Weeks in a year | 52 |
| Months in a year | 12 |
| Days in a leap year | 366 |
| Months with 30 days | April, June, September, November |
| Months with 31 days | Jan, Mar, May, Jul, Aug, Oct, Dec |
| February | 28 days (29 in leap year) |
Convert 3:30 pm to 24-hour clock.
A lesson starts at 9:45 and ends at 10:30. How long is it?
A film starts at 14:00 and lasts 1 hour 30 minutes. What time does it end?
How many days are there from March to August inclusive?
How many minutes past the hour does each clock show?
Write each time in 24-hour format (e.g. 1530).
Calculate the duration in minutes between each pair of times.
Find the end time. Write as HHMM (e.g. 930 for 9:30).
Answer each calendar question.