Date Calculator
Date difference, addition, and business day calculation with Japanese holidays.
How to use
- Select the calculation mode.
- Enter the base date and value.
- Choose business day options if needed.
- View the calculated result instantly.
About this tool
The Date Calculator handles three common calculations in one place: the difference between two dates, adding or subtracting days from a base date, and counting business days while excluding weekends and Japanese public holidays. Everything runs instantly in your browser.
Features
Three calculation modes, holiday-aware business day mode, support for years, months, and days, and clear result formatting. The holiday list is built into the tool and covers modern Japanese public holidays.
Use cases
Useful for planning project deadlines, estimating delivery dates, calculating contract durations, scheduling holidays, or figuring out how many business days remain until a given milestone at work or school.
Why this tool
Counting days by hand is slow and error prone, especially when public holidays matter. This tool combines three calculators in one interface, saving time and ensuring consistent results across your workflow.
FAQ
- Does it skip Japanese holidays?
- Yes, business day mode excludes weekends and Japanese public holidays automatically.
- Can I calculate past dates?
- Yes, you can subtract days to calculate dates in the past.
- What date formats are supported?
- Standard YYYY-MM-DD format is used for input and output.