Week number

What is this weeks number?

How does week numbers work?

It can be a little confusing with week numbers because it can differ a bit according to in which part of the world your from.

When is week number 1? (ISO)

  • If January 1 falls on Monday – Thursday, then the week of January 1 is Week 1.
  • If January 1 falls on a Friday – Sunday, then January 1 is considered to be part of the last week of the previous year and Week 1 will begin on the first Monday after January 1.

The highest week number in a year is either 52 or 53.

First day of the week

In most countries they use the ISO standard and first day of the week is always a Monday and Sunday the last.

– EU and most of other European countries, most of Asia and Oceania:

ISO-8601 / week starts with Monday

– Canada, United States, Iceland, Portugal, Japan, Taiwan, Thailand, Hong Kong, Macau, Israel, Egypt, South Africa, the Philippines, and most of Latin America:

Western traditional / week starts with Sunday

– Much of the Middle East:

Middle Eastern / week starts with Saturday

Number of weeks in a year


What about today´s date? / Date two weeks from now?

Read more about week numbers on Wikipedia:

https://en.wikipedia.org/wiki/Week#Week_numbering