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Calendar – Today’s Date, Week Numbers and Public Holidays

What’s the date, which week is it and how many days are left this year? See today at a glance, browse any month or year with week numbers, and show the public holidays of your country.

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Runs in your browser – your data never leaves your device Also available via our free API

How to use the Calendar

  1. 1 Today is selected automatically: the panel shows the weekday, ISO week, day of the year, quarter and days left in the year.
  2. 2 Browse months with ‹ and ›, switch to the year view, or click any day to see its details – the arrow keys work too.
  3. 3 Choose a country to mark its public holidays in the calendar and list them for the year.

Week numbers the ISO way

The week numbers in this calendar follow the international standard ISO 8601, used in most of Europe: weeks start on Monday and week 1 is the week that contains the first Thursday of the year (so it always contains 4 January). That is why 1 January can still belong to week 52 or 53 of the previous year, and why some years have 53 weeks. When the week belongs to another year, the panel says so – for example “Week 1 of 2027” on 30 December 2026.

Day of the year, quarter and leap years

The day of the year counts from 1 January (day 1) to 31 December (day 365, or 366 in a leap year). The quarter splits the year in four: Q1 is January–March, Q2 April–June, Q3 July–September and Q4 October–December. A leap year is divisible by 4, except century years that are not divisible by 400: 2024 and 2000 were leap years, 2100 will not be.

Public holidays

Choose a country to show its public holidays. They are calculated from the official rules, so they work for any year:

  • Netherlands: New Year’s Day, Good Friday, Easter, King’s Day (27 April, or 26 April when that is a Sunday), Liberation Day, Ascension Day, Whitsun and Christmas.
  • Belgium: the ten legal public holidays, including Easter Monday, Labour Day, the National Day (21 July) and Armistice Day.
  • Germany: the nine nationwide holidays, including German Unity Day (3 October). Some states have extra holidays.
  • United Kingdom: the bank holidays of England and Wales, including substitute days when a holiday falls on a weekend and one-off holidays such as the 2023 coronation.
  • United States: the eleven federal holidays, with the Friday or Monday on which a weekend holiday is observed.

Easter, and the holidays that move with it, are calculated with the Gregorian Easter algorithm. Holidays in the past follow today’s rules plus the main historical changes; for official purposes, check the government sources below.

Sources

Frequently asked questions

Which week number is it today?

The calendar opens on today and shows the ISO week number in the panel and in the first column of the month view.

Why does 1 January sometimes fall in week 52 or 53?

ISO week 1 is the week with the first Thursday of the year. If 1 January falls on a Friday, Saturday or Sunday, it still belongs to the last week of the previous year.

Are the public holidays correct for other years?

Yes, they are calculated from the official rules for any year, including Easter-based holidays and substitute days. Historic years follow today’s rules plus the main changes, such as the switch from Queen’s Day to King’s Day in 2014.

Can I add the calendar to my start page?

Yes. Add it as a widget to My tools on the Synsi homepage to see today’s date, week number and holidays at a glance.

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