Week and day number of a date

Online tool for calculating week number and day of the week based on a date.

Week Number Calculator

Choose a date to find out its week number, as well as the corresponding day of the week. You can view the day's info directly by clicking here.

Result

Friday, January 16, 2026 is part of week 3, which runs from Monday, January 12, 2026 to Sunday, January 18, 2026.

Calculation form