All tools · Date and time tools

Week Number

ISO-8601 week number for any date.

Free to use, no sign-up required. Week Number is one of 198 tools built into Xenition, alongside a chat that can use them for you.

Use it from chat

You do not have to open Week Number to use it. Ask Xenition in plain language and it runs the right tool, then carries the answer into whatever you are working on — a document, a spreadsheet, a deck.

Related tools

• Prime Checker — Check if a number is prime and find its factors.
• Business Days — Working days (Mon–Fri) between two dates.
• Countdown — A live countdown to any date and time.
• Cron Describer — Explain a 5-field cron expression in plain English.
• Date Calculator — Days between dates, or add/subtract days from a date.
• Day of the Week — Find the weekday of any date.
• Days Until — Count days until (or since) a date.
• Time Duration — The time between two dates/times.