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, May 9, 2025 is part of week 19, which runs from Monday, May 5, 2025 to Sunday, May 11, 2025.

Calculation form