What Week of the Year Is It?
Check today’s ISO week
This is calculated from today’s date and follows your local time zone.
Week 44
Day 302 of the year
What Day of the Year Is It?
Need the exact ordinal date? Jump to our day-of-the-year page to see today’s day number and related formats.
Week calendar
ISO week number — quick FAQ
What is an ISO week?
It’s a calendar convention where weeks start on Monday, and Week 01 is the week containing January 4. This keeps week numbering consistent between years and countries.
Does this follow my time zone?
Yes. We compute the current week from your device’s clock and time zone. Values update every minute and roll over at your local midnight.
How many ISO weeks are there?
Most years have 52 ISO weeks. Some have 53, depending on how the first Thursday of the year lines up. We detect this automatically.
How this page calculates the current week (and why it’s reliable)
When you coordinate releases, sprints, or academic terms, it’s faster to say “Week 44” than to spell out a date range. This page shows the current ISO week number in large type, with the day of the year just underneath for quick cross‑checks. The calculation runs entirely in your browser using your device’s clock, so the result matches what your local calendar would show right now.
ISO week rules in one minute. ISO 8601 defines weeks that start on Monday. The first week of the year (Week 01) is the one that contains Thursday, January 4. That definition avoids partial weeks at the boundaries and keeps week numbers consistent across time zones and organizations. Because of how the days fall, most years have 52 ISO weeks, but some have 53. We detect that automatically so the number you see always reflects the standard.
Why week numbers matter. Teams that work in two‑week sprints, quarterly roadmaps, or release trains often schedule by week number. Operations, logistics, retail promotions, and payroll close calendars also map tasks by week. Using Week NN avoids confusion caused by regional date formats—“10/12” can mean October 12 in the U.S. or 10 December elsewhere. Week numbers are unambiguous, compact, and easy to scan in chat, tickets, and dashboards.
How we compute it. The script converts the current date to a UTC‑based value, shifts to the Thursday of that week (a standard ISO trick), and measures the gap to the first Thursday of the year. Divide by seven, round, and you have the week index. Because we reference your device’s time zone and refresh every minute, the display flips right at your local midnight without a page reload. Nothing is sent to a server, which keeps things private and fast even if you’re on a flaky connection.
Start and end dates for this week. Once we know the current ISO week, it’s straightforward to compute the Monday (start) and Sunday (end) dates. That range is handy for time sheets, production freezes, content calendars, or status emails. Many spreadsheet apps expose the same logic—try ISOWEEKNUM() to extract a week number and simple date arithmetic to back into the Monday/Sunday boundaries.
Day number for progress tracking. Right under the headline we show today’s day of the year (an ordinal date from 1 to 365, or 366 in leap years). Day numbers are excellent for burn‑down charts, annual OKRs, and long campaigns. Together with the week number, they give you both a granular and a weekly view of where you are in the calendar.
About the week calendar below. The table renders each month with a left‑hand WN column for the ISO week number and columns for Monday through Sunday. It’s designed for a quick skim on phones and a compact glance on desktops. We highlight today so your eye lands instantly, while keeping the typography light so the grid doesn’t compete with your main calendar app.
Tips for documentation and teams. Use week numbers in policies, SOPs, and tickets whenever you can. For example, “deployments are paused in Week 52,” or “Retail campaign runs Weeks 48–50.” For cross‑border teams, combine ISO weeks with the universally safe date format YYYY‑MM‑DD to avoid ambiguity. If you need a natural‑language date string, pair this page with our today’s date page; for a pure ordinal, use the day‑of‑the‑year page.