Day 243 of the year
The 243rd day of 2026 is Monday, August 31, 2026. It was 23 days ago.
Where day 243 lands in other years
The calendar date for a given day number moves only because of leap years. In a common year day 243 is one date; from 1 March in a leap year it shifts back by one.
| Year | Date | Weekday | Leap year |
|---|---|---|---|
| 2026 | August 31 | Monday | no |
| 2027 | August 31 | Tuesday | no |
| 2028 | August 30 | Wednesday | yes |
| 2029 | August 31 | Friday | no |
| 2030 | August 31 | Saturday | no |
Day 243 in context
Day 243 sits in August, on the 31st of the month, in the third quarter. By that point 242 days of the year have already gone and the year is 66.6% complete.
| Anchor | Day number | Distance from day 243 |
|---|---|---|
| 1 January | 1 | 242 days before |
| 1 April | 91 | 152 days before |
| 1 July | 182 | 61 days before |
| 1 October | 274 | 31 days after |
| 31 December | 365 | 122 days after |
Counting to and from day 243
Ordinal day numbers make in-year arithmetic trivial: the gap between two dates in the same year is just the difference of their day numbers. Day 243 minus today's day 266 gives 23 days, with no month lengths to reason about. That is exactly why batch codes, expiry stamps and flight schedules use them.
Questions
- What date is day 243 of the year?
- Monday, August 31, 2026.
- What weekday is it?
- A Monday in 2026.
- How far away is it?
- 23 days ago.
Reading the number back
To go the other way, from a calendar date to a day number, add up the lengths of the months before it and then add the day of the month. For August 31 in 2026 that is 212 days across the earlier months plus 31, giving 243. The only wrinkle is February, which is why the same date can carry two different day numbers depending on whether the year is a leap year.