Day 80 of the year
The 80th day of 2026 is Saturday, March 21, 2026. It was 186 days ago.
Where day 80 lands in other years
The calendar date for a given day number moves only because of leap years. In a common year day 80 is one date; from 1 March in a leap year it shifts back by one.
| Year | Date | Weekday | Leap year |
|---|---|---|---|
| 2026 | March 21 | Saturday | no |
| 2027 | March 21 | Sunday | no |
| 2028 | March 20 | Monday | yes |
| 2029 | March 21 | Wednesday | no |
| 2030 | March 21 | Thursday | no |
Day 80 in context
Day 80 sits in March, on the 21st of the month, in the first quarter. By that point 79 days of the year have already gone and the year is 21.9% complete.
| Anchor | Day number | Distance from day 80 |
|---|---|---|
| 1 January | 1 | 79 days before |
| 1 April | 91 | 11 days after |
| 1 July | 182 | 102 days after |
| 1 October | 274 | 194 days after |
| 31 December | 365 | 285 days after |
Counting to and from day 80
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 80 minus today's day 266 gives 186 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 80 of the year?
- Saturday, March 21, 2026.
- What weekday is it?
- A Saturday in 2026.
- How far away is it?
- 186 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 March 21 in 2026 that is 59 days across the earlier months plus 21, giving 80. 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.