AI logs your meals from a photo. Diet & workouts in one app.Get the free appWhat Week Is It?
Current ISO week number and week lookup for any date
…
ISO-8601 weeks start on Monday, and week 1 is the week that contains the year's first Thursday. That means January 1 can still belong to week 52 or 53 of the previous year.
How many weeks are in a year?
Most years have 52 ISO weeks, but years that start on a Thursday, and leap years that start on a Wednesday, have 53 weeks.
Why does my calendar show a different week number?
Some regions, such as the US, start weeks on Sunday and count from the week containing January 1. This page uses the international ISO-8601 standard.