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Day Numbers by Month
| Month | Day 1 | Last Day |
|---|---|---|
| January | 1 | 31 |
| February | 32 | 59 (60) |
| March | 60 (61) | 90 (91) |
| April | 91 (92) | 120 (121) |
| May | 121 (122) | 151 (152) |
| June | 152 (153) | 181 (182) |
| July | 182 (183) | 212 (213) |
| August | 213 (214) | 243 (244) |
| September | 244 (245) | 273 (274) |
| October | 274 (275) | 304 (305) |
| November | 305 (306) | 334 (335) |
| December | 335 (336) | 365 (366) |
* Numbers in parentheses are for leap years
📊 Common Uses
- • Project milestone tracking
- • Annual goal progress
- • File naming conventions
- • Julian date calculations
- • Manufacturing batch codes
💡 Did You Know?
- • Day 100 falls on April 10th (April 9th in leap years)
- • The middle of the year is around day 182-183
- • Julian dates use day-of-year numbering
- • Many industries use ordinal dates for tracking
Frequently Asked Questions
What day of the year is today?
The current day number is shown at the top of this page. It updates daily and counts from January 1st (day 1) through December 31st (day 365 or 366).
How many days into the year are we?
The number of days into the year is the same as the day-of-year number. Check the progress bar above to see exactly how far through the year we are.
How do I calculate day of the year for any date?
Add the days from each completed month plus the current day. For March 15th: 31 (Jan) + 28 (Feb) + 15 = day 74. Use our calculator for instant results.
What is an ordinal date?
An ordinal date uses the format YYYY-DDD, where DDD is the day of the year (001-365 or 366). Example: 2024-074 means March 14, 2024.
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