Find the day number inside the year and how many days remain.
The day of year is how many days the date sits after January 1, and the remaining count flows from the year total. Ordinal dates are standard in astronomy and logistics for comparing dates across different months.
Day of Year
Day of year = date - January 1 + 1; percent = day of year / days in year
Day of year = date - January 1 + 1; percent = day of year / days in year The day of year is how many days the date sits after January 1, and the remaining count flows from the year total.
Ordinal dates are standard in astronomy and logistics for comparing dates across different months.
This calculator takes 3 inputs: Year, Month, Day. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.