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 is designed to convert the ordinal 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 1st January. The first day of the year always has the number one. The last day of the year – 31st December – has the number 365 in a regular year and 366 in a leap year. The difference arises due to the presence of 29th 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 |