Week Numbers

Week Numbers for the Year 2020

Knowing the week numbers for 2020 can be helpful for planning events, managing projects, or simply staying organized. Here’s a complete breakdown of all the weeks in 2020, 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 2020

Week NumberStart DateEnd Date
Week 1Dec 30, 2019Jan 5, 2020
Week 2Jan 6, 2020Jan 12, 2020
Week 3Jan 13, 2020Jan 19, 2020
Week 4Jan 20, 2020Jan 26, 2020
Week 5Jan 27, 2020Feb 2, 2020
Week 6Feb 3, 2020Feb 9, 2020
Week 7Feb 10, 2020Feb 16, 2020
Week 8Feb 17, 2020Feb 23, 2020
Week 9Feb 24, 2020Mar 1, 2020
Week 10Mar 2, 2020Mar 8, 2020
Week 11Mar 9, 2020Mar 15, 2020
Week 12Mar 16, 2020Mar 22, 2020
Week 13Mar 23, 2020Mar 29, 2020
Week 14Mar 30, 2020Apr 5, 2020
Week 15Apr 6, 2020Apr 12, 2020
Week 16Apr 13, 2020Apr 19, 2020
Week 17Apr 20, 2020Apr 26, 2020
Week 18Apr 27, 2020May 3, 2020
Week 19May 4, 2020May 10, 2020
Week 20May 11, 2020May 17, 2020
Week 21May 18, 2020May 24, 2020
Week 22May 25, 2020May 31, 2020
Week 23Jun 1, 2020Jun 7, 2020
Week 24Jun 8, 2020Jun 14, 2020
Week 25Jun 15, 2020Jun 21, 2020
Week 26Jun 22, 2020Jun 28, 2020
Week 27Jun 29, 2020Jul 5, 2020
Week 28Jul 6, 2020Jul 12, 2020
Week 29Jul 13, 2020Jul 19, 2020
Week 30Jul 20, 2020Jul 26, 2020
Week 31Jul 27, 2020Aug 2, 2020
Week 32Aug 3, 2020Aug 9, 2020
Week 33Aug 10, 2020Aug 16, 2020
Week 34Aug 17, 2020Aug 23, 2020
Week 35Aug 24, 2020Aug 30, 2020
Week 36Aug 31, 2020Sep 6, 2020
Week 37Sep 7, 2020Sep 13, 2020
Week 38Sep 14, 2020Sep 20, 2020
Week 39Sep 21, 2020Sep 27, 2020
Week 40Sep 28, 2020Oct 4, 2020
Week 41Oct 5, 2020Oct 11, 2020
Week 42Oct 12, 2020Oct 18, 2020
Week 43Oct 19, 2020Oct 25, 2020
Week 44Oct 26, 2020Nov 1, 2020
Week 45Nov 2, 2020Nov 8, 2020
Week 46Nov 9, 2020Nov 15, 2020
Week 47Nov 16, 2020Nov 22, 2020
Week 48Nov 23, 2020Nov 29, 2020
Week 49Nov 30, 2020Dec 6, 2020
Week 50Dec 7, 2020Dec 13, 2020
Week 51Dec 14, 2020Dec 20, 2020
Week 52Dec 21, 2020Dec 27, 2020
Week 53Dec 28, 2020Jan 3, 2021

Yes, 2020 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: 18

List the week numbers of the coming years.