Day 30 of the year
The 30th day of 2026 is Friday, January 30, 2026. It was 236 days ago.
Where day 30 lands in other years
The calendar date for a given day number moves only because of leap years. In a common year day 30 is one date; from 1 March in a leap year it shifts back by one.
| Year | Date | Weekday | Leap year |
|---|---|---|---|
| 2026 | January 30 | Friday | no |
| 2027 | January 30 | Saturday | no |
| 2028 | January 30 | Sunday | yes |
| 2029 | January 30 | Tuesday | no |
| 2030 | January 30 | Wednesday | no |
Day 30 in context
Day 30 sits in January, on the 30th of the month, in the first quarter. By that point 29 days of the year have already gone and the year is 8.2% complete.
| Anchor | Day number | Distance from day 30 |
|---|---|---|
| 1 January | 1 | 29 days before |
| 1 April | 91 | 61 days after |
| 1 July | 182 | 152 days after |
| 1 October | 274 | 244 days after |
| 31 December | 365 | 335 days after |
Counting to and from day 30
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 30 minus today's day 266 gives 236 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 30 of the year?
- Friday, January 30, 2026.
- What weekday is it?
- A Friday in 2026.
- How far away is it?
- 236 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 30 in 2026 that is 0 days across the earlier months plus 30, giving 30. 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.