ISO week dates explained
Read dates written as week-year, week number and weekday.
What it means
Read dates written as week-year, week number and weekday.
How to calculate or use it
Combine the ISO year, a two-digit week and weekday number from one through seven.
Important details
The ISO year is not always the calendar year.
Related weeks guides
- Start and end of a week — Calculate the Monday and Sunday surrounding a date.
- When does week 53 occur? — Identify ISO years with an additional numbered week.
- Work week vs calendar week — Distinguish scheduled working days from a seven-day period.