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Find the ordinal day number for any date with days remaining and year progress.
The day of year (ordinal date) is a number from 1 to 365 (or 366 in leap years) representing the sequential day count from January 1st.
| Day # | Date | Event |
|---|---|---|
| 1 | Jan 1 | New Year's Day |
| 79 | Mar 20 | Spring Equinox |
| 172 | Jun 21 | Summer Solstice |
| 266 | Sep 23 | Autumn Equinox |
| 355 | Dec 21 | Winter Solstice |
| 365 | Dec 31 | New Year's Eve |
Formula
Day of Year = (Date − January 1 of the same year) + 1Date = The target date you want to find the ordinal day for
January 1 = The first day of the same calendar year
Worked Example
March 19, 2026
Did you know? The U.S. National Weather Service uses ordinal day numbers (Julian dates) in all weather observation records for unambiguous date references across time zones.
Sources
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