In Europe and most of the world a week starts Monday and ends Sunday. ISO 8601 defines week 1 as the week containing the first Thursday of the year — always having at least 4 days in the new year.
In the United States, Canada and Mexico the week starts on Sunday. Week 1 always begins on January 1st regardless of weekday — which can produce up to 54 weeks in a calendar year.
The official notation is YYYY-Www-D — for example today is . The W stands for Week and D is the day number (1=Mon, 7=Sun).
Exact days, weeks, months and working days between any two dates.
Find the date a given number of days, weeks or months from any starting date.
WeekOf.today was built out of frustration. Every existing week number site was either ugly, cluttered with ads, or required you to squint at tiny text on a grey background. We thought there was room for something better — a clean, fast, genuinely useful date and week number tool that you'd actually enjoy using.
The site covers everything from ISO 8601 week codes used by project managers and logistics teams across Europe, to regional week conventions in the US, Middle East and beyond. It's built for office workers, developers, planners, PAs and anyone who has ever typed "what week is it?" into Google.
WeekOf.today is part of a small family of date and number tools. If you work with percentages, check out our sister site TurboPercent.com.
Every ISO calendar week from 2024 to 2028 has its own dedicated, searchable page.
Public holiday data covering 15 countries across Europe, the Americas, Asia and Oceania.
Week numbers never expire. Content from 2024 stays useful in 2030 and beyond.
For general enquiries, feedback, data corrections, partnership proposals or press enquiries. We aim to respond within 2 business days.
If you work with percentages regularly, check out our sister site TurboPercent.com — fast, clean percentage calculators with the same no-nonsense approach.
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For privacy enquiries contact us at admin@weekof.today.