Calculate the week number for any date, see current week dates, and convert between dates and week numbers. Perfect for project planning and scheduling.
A week number represents the specific week of the year. In the ISO 8601 calendar, weeks start with Monday and end on Sunday, with approximately 52 weeks in a year. The first week (Week 1) contains the first Thursday of the year. Some years may have 53 weeks when January 1 falls on a Thursday (or Wednesday in leap years).
The current week number and date range are shown automatically when you visit the page
Select any date to find its corresponding week number in the year
Enter a week number and year to see the corresponding date range