Day Number

This tool calculates the day number of a date.
The day number of January 1st is 1. The day number of December 31th is 365 or 366 depending on whether the year is leap or not.

See also

Date difference
Hour difference
Calculate an age
Shift a date
Working days
Week number
Time Zones
Time Cities
Decimal to time Conversion
Time to decimal Conversion
Time unit Conversion
Date to timestamp
Timestamp to date