Veckans nummerkalkylator

Beräkna ISO-veckans nummer för alla datum

tools.weekNumberCalculator.title

tools.weekNumberCalculator.description

tools.weekNumberCalculator.weekNumber
9
2026

tools.weekNumberCalculator.isoStandard

Week Number Calculator determines the ISO week number for any date and calculates date ranges for specific weeks in international standards.

Características Principales

ISO week number

Week date range

Year week selection

Multi-year support

Monday start option

Week planning

How to Use Week Number Calculator

1

Enter Date

Select or input a date

2

Get Week Number

See the ISO week number

3

View Week Range

Check the date range for that week

4

Plan Week

Use for weekly scheduling

Casos de Uso

Project management

Weekly reporting

Scheduling systems

Date standardization

Preguntas Frecuentes

What is the ISO week date system?

ISO 8601 defines week 1 as the first week with a Thursday, ensuring weeks start on Monday.

Why are some years 53 weeks long?

Years with 53 weeks occur roughly every 5-6 years when January 1 falls on a Thursday.

How does this differ from US week numbering?

The US system starts weeks on Sunday and counts differently. ISO is international standard.

Can I convert back from week number to dates?

Yes, enter the week number and we'll show the date range for that week.

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Información de la Herramienta

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