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Is Sunday The First Day Of The Week?

Last Updated: July 23, 2025 1 Comment

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Is Sunday The First Day Of The Week?

Map created by geo.facts_
The map above shows whether or the first day of the week begins on a Sunday or Monday. From the author:

This might seem odd to most Europeans, but most of the world population considers Sunday as being the first day of the week, mostly due to China, India, Japan, *MOST* of Latin America and the USA, countries and regions with a huge population number.

Apart from that, Portugal, Malta and the UK do also consider it, this happens due to a biblical fundament, in which Sunday is considered a holy day!

🚨: there is some controversy about this topic in the UK. Some consider it as Monday and some as Sunday.
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Sources: Quora, Unicode ORG, Wikipedia and Charts bin

In the UK, the first day of the week is officially Monday (according to the international standard), but many people informally treat Sunday as the start of the week. Here’s why:

ISO Standard vs. Cultural Practice

  • The ISO 8601 international standard defines Monday as the first day of the week.
  • The UK officially follows ISO 8601 for government and business purposes.
  • However, culturally and religiously, many calendars, planners, and people treat Sunday as the first day, especially in older calendars and Christian traditions.

Christian Influence

  • In Christianity, Sunday is the Lord’s Day (the day of Christ’s resurrection) and was historically seen as the first day of the week.
  • This tradition lingers in many parts of British life, like church calendars or traditional diaries.

Why Do Other Countries Start the Week on Sunday?

Religious and Historical Tradition

  • In Judaism, the Sabbath (Saturday) is the 7th day, so Sunday is naturally the first day of the new week.
  • This carried into Christian tradition, and by extension, into the calendars of many Western countries.

American Influence

  • The United States and some other countries (like Canada, Japan, and parts of Latin America) commonly use calendars that begin with Sunday.
  • American-made software, calendars, and planners have reinforced this globally, especially through tech platforms.

Official First Day of the Week by Region

Region/CountryFirst Day (Official)Notes
Most of EuropeMondayFollows ISO 8601
United StatesSundayTradition and religious roots
Middle EastSaturday/Sunday or MondayVaries; Sunday often a workday
UKMonday (official) / Sunday (informal)Mix of ISO standard and tradition
JapanSundayCultural convention
IsraelSundayReflects Sabbath (Saturday) as last day

Filed Under: Europe

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Comments

  1. gOATY BOATY says

    November 11, 2025 at 9:51 am

    good shit man

    Reply

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