Weekday Calculator
Show day of week, week number, and day of year for any date
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About Weekday Calculator
The Weekday Calculator is an online tool that instantly determines the day of the week for any date you enter. It displays the weekday name in Japanese (Monday through Sunday), the day of year (ordinal day), the ISO 8601 week number, and whether the date falls on a weekday or weekend.
Quickly answer questions like 'What day was that?' or 'What day of the week is my birthday next year?' No more flipping through calendars. It supports a wide range of dates from the past to the future, making it useful for verifying historical event days and planning future schedules.
All processing is done entirely in your browser, so no input data is ever transmitted externally. Use it with complete confidence in your privacy.
How to use Weekday Calculator
- Enter a date (defaults to today)
- The weekday, day of year, ISO week number, and weekday/weekend status are displayed automatically
- Enter any past or future date to check its day of the week
Benefits of Weekday Calculator
- Instant weekday display in Japanese
- Shows day of year and ISO week number
- Weekday/weekend classification included
- Browser-only processing ensures privacy
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