Calendar Week. It has 52 weeks and starts on wednesday, january 1st 2025. On this website we've also listed annual and monthly calendars including 2025, 2026 and 2027.
The calendar week (cw) is a week that begins on monday and ends on sunday. The calendar week for today, 24/01/2025, is calendar week 4 / 2025 and starts on monday, 20/01/2025, until sunday, 26/01/2025.