When to use this tool
- Label weekly reports.
- Align sprint and operations calendars.
- Find the day of year for logs or reports.
Pick a date and see its ISO week, ISO week-year, day of year, and weekday.
An ISO week number identifies a week using the ISO 8601 week-date calendar.
ISO week 1 is the week containing the first Thursday of the calendar year.
Yes. Dates near New Year can belong to the previous or next ISO week-year.
ISO weeks start on Monday.