ISO week calendar

Week numbers and exact dates

Find the current ISO week number and browse exact Monday-to-Sunday dates for every week from 2024 through 2028.

Current ISO week

TodayWeek --Calculating dates…Open current week

Browse by year

Week numbers 202452 ISO weeks and exact dates →Week numbers 202552 ISO weeks and exact dates →Week numbers 202653 ISO weeks and exact dates →Week numbers 202752 ISO weeks and exact dates →Week numbers 202852 ISO weeks and exact dates →

How ISO week numbers work

ISO weeks start on Monday and end on Sunday. Week 1 is the week containing the year’s first Thursday, so the first few days of January can belong to the previous ISO week-year.

Use an individual week page for the exact seven dates, ISO code, day-of-year range, a calendar download and links to the same week in nearby years.