Calculateur de semaine ISO

Calculer les numeros de semaine ISO

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ISO Week

W14

2026-W14-3

ISO Year

2026

ISO Weekday

3 (Wednesday)

Week 14 Range

Start (Monday):Mar 30, 2026End (Sunday):Apr 5, 2026

Days in This ISO Week

Mon

30

Tue

31

Wed

1

Thu

2

Fri

3

Sat

4

Sun

5

Find Date from ISO Week

Monday, December 29, 2025

2026 ISO Weeks Overview

Total weeks:53First week starts:Dec 29, 2025Last week ends:Jan 3, 2027Week type:Long year
ISO Week Rules

ISO 8601 week date standard:

  • Weeks start on Monday (day 1) and end on Sunday (day 7)
  • Week 1 is the week containing the first Thursday of the year
  • Equivalently: Week 1 contains January 4th
  • A year can have 52 or 53 weeks
  • Dec 31 might be in week 1 of next year
  • Jan 1 might be in week 52/53 of previous year

ISO Week format: YYYY-Www-D

Example: 2024-W15-3 = Wednesday of week 15, 2024

About Calculateur de semaine ISO

Calculer les numeros de semaine ISO

Use this free online outils date et heure tool to work faster without installing extra software. The interface is built for quick input, clear output, and straightforward results on desktop and mobile devices.

Processing

This tool runs in your browser whenever possible, which keeps your inputs private and reduces unnecessary round-trips to the server.

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