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Week of the Year

Find the current ISO 8601 week and see the calendar of all weeks.

Week 42

This week runs from Monday October 12, 2026 to Sunday October 18, 2026

Hover over or tap a week to see its date range.

About Week of the Year

Find the current ISO 8601 week and see the calendar of all weeks.

How it works

Week numbers follow ISO 8601: weeks begin on Monday, and week 1 contains the year's first Thursday.

How to use

  1. Read the current week.
  2. Hover over or tap a week.
  3. Check its Monday-to-Sunday interval.

Practical example

Dates at the beginning of January can belong to the previous ISO week-year.

Useful tips

ISO weeks differ from week systems that begin on Sunday.