Date by Day Number in Year
Enter the day number and year to determine the calendar date.
Calculator: date by day number in year
This tool converts a day number to a calendar date (day, month, and day of the week) based on the number and specified year.
How Days Are Counted
Day counting starts from 1 January. The first day of the year always has the number one. The last day of the year – 31 December – has the number 365 in a regular year and 366 in a leap year. The difference arises due to the presence of 29 February.
The application automatically determines whether the selected year is a leap year.
Examples
| Day Number | Year | Date |
|---|---|---|
| 1 | 2026 | 01/01/2026 |
| 60 | 2023 | 01/03/2023 |
| 60 | 2024 | 29/02/2024 |
| 135 | 2026 | 15/05/2026 |
| 366 | 2024 | 31/12/2024 |
| 365 | 2025 | 31/12/2025 |