Day 10 of the year
The 10th day of 2026 is Saturday, January 10, 2026. It was 256 days ago.
Where day 10 lands in other years
The calendar date for a given day number moves only because of leap years. In a common year day 10 is one date; from 1 March in a leap year it shifts back by one.
| Year | Date | Weekday | Leap year |
|---|---|---|---|
| 2026 | January 10 | Saturday | no |
| 2027 | January 10 | Sunday | no |
| 2028 | January 10 | Monday | yes |
| 2029 | January 10 | Wednesday | no |
| 2030 | January 10 | Thursday | no |
Day 10 in context
Day 10 sits in January, on the 10th of the month, in the first quarter. By that point 9 days of the year have already gone and the year is 2.7% complete.
| Anchor | Day number | Distance from day 10 |
|---|---|---|
| 1 January | 1 | 9 days before |
| 1 April | 91 | 81 days after |
| 1 July | 182 | 172 days after |
| 1 October | 274 | 264 days after |
| 31 December | 365 | 355 days after |
Counting to and from day 10
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 10 minus today's day 266 gives 256 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 10 of the year?
- Saturday, January 10, 2026.
- What weekday is it?
- A Saturday in 2026.
- How far away is it?
- 256 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 January 10 in 2026 that is 0 days across the earlier months plus 10, giving 10. 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.