Week Numbers

Week Numbers for the Year 2026

Knowing the week numbers for 2026 can be helpful for planning events, managing projects, or simply staying organized. Here’s a complete breakdown of all the weeks in 2026, including their start and end dates.

What Are Week Numbers?

Week numbers are a standardized way of counting the weeks in a year. Each week is assigned a number from 1 to 52 (sometimes 53), depending on how the calendar aligns with the start of the year. According to the ISO 8601 standard, each week starts on a Monday, and Week 1 is the week that contains the first Thursday of the year.

Week Number Table for 2026

Week NumberStart DateEnd Date
Week 1Dec 29, 2025Jan 4, 2026
Week 2Jan 5, 2026Jan 11, 2026
Week 3Jan 12, 2026Jan 18, 2026
Week 4Jan 19, 2026Jan 25, 2026
Week 5Jan 26, 2026Feb 1, 2026
Week 6Feb 2, 2026Feb 8, 2026
Week 7Feb 9, 2026Feb 15, 2026
Week 8Feb 16, 2026Feb 22, 2026
Week 9Feb 23, 2026Mar 1, 2026
Week 10Mar 2, 2026Mar 8, 2026
Week 11Mar 9, 2026Mar 15, 2026
Week 12Mar 16, 2026Mar 22, 2026
Week 13Mar 23, 2026Mar 29, 2026
Week 14Mar 30, 2026Apr 5, 2026
Week 15Apr 6, 2026Apr 12, 2026
Week 16Apr 13, 2026Apr 19, 2026
Week 17Apr 20, 2026Apr 26, 2026
Week 18Apr 27, 2026May 3, 2026
Week 19May 4, 2026May 10, 2026
Week 20May 11, 2026May 17, 2026
Week 21May 18, 2026May 24, 2026
Week 22May 25, 2026May 31, 2026
Week 23Jun 1, 2026Jun 7, 2026
Week 24Jun 8, 2026Jun 14, 2026
Week 25Jun 15, 2026Jun 21, 2026
Week 26Jun 22, 2026Jun 28, 2026
Week 27Jun 29, 2026Jul 5, 2026
Week 28Jul 6, 2026Jul 12, 2026
Week 29Jul 13, 2026Jul 19, 2026
Week 30Jul 20, 2026Jul 26, 2026
Week 31Jul 27, 2026Aug 2, 2026
Week 32Aug 3, 2026Aug 9, 2026
Week 33Aug 10, 2026Aug 16, 2026
Week 34Aug 17, 2026Aug 23, 2026
Week 35Aug 24, 2026Aug 30, 2026
Week 36Aug 31, 2026Sep 6, 2026
Week 37Sep 7, 2026Sep 13, 2026
Week 38Sep 14, 2026Sep 20, 2026
Week 39Sep 21, 2026Sep 27, 2026
Week 40Sep 28, 2026Oct 4, 2026
Week 41Oct 5, 2026Oct 11, 2026
Week 42Oct 12, 2026Oct 18, 2026
Week 43Oct 19, 2026Oct 25, 2026
Week 44Oct 26, 2026Nov 1, 2026
Week 45Nov 2, 2026Nov 8, 2026
Week 46Nov 9, 2026Nov 15, 2026
Week 47Nov 16, 2026Nov 22, 2026
Week 48Nov 23, 2026Nov 29, 2026
Week 49Nov 30, 2026Dec 6, 2026
Week 50Dec 7, 2026Dec 13, 2026
Week 51Dec 14, 2026Dec 20, 2026
Week 52Dec 21, 2026Dec 27, 2026
Week 53Dec 28, 2026Jan 3, 2027

Yes, 2026 has 53 weeks! This happens when the year starts on a Thursday or is a leap year that ends on a Thursday—allowing for that extra ISO week.

Why Are Week Numbers Useful?

Week numbers are used in a variety of scenarios across professional and personal settings:

Fun Fact

The ISO 8601 week-numbering system was first introduced in 1988 and is used by many countries around the world, especially in Europe. The U.S. doesn't commonly use it, but many global systems rely on it for consistency.

Find the Week Number of Any Date

Want to know the week number of a specific date? In PHP, you can use the DateTime object like this:

Week number is: 14

List the week numbers of the coming years.