Date Calculator
Count days between two dates, add or subtract days, and view weekday, week number, and Japanese era.
Days between two dates
0 days
Add / subtract from a date
August 21, 2026 (Friday)
Date info
WeekdayWednesday
Day of year203
ISO week number30
Japanese era令和8年7月22日
How to use
- Pick the tool you want to use.
- Enter your input or adjust the options.
- Copy or download the result.
FAQ
Is it free to use?
Yes. All features are free with no usage limits, and no account is required.
Is my input sent to a server?
No. Everything runs locally in your browser — your data never leaves your device.
Does it work on smartphones?
Yes. It works on both desktop and mobile with modern browsers such as Chrome, Edge, Firefox and Safari.