Date Calculator
Date Calculator — runs in your browser. Inputs are not stored.
Date calculator
Enter values, then press Calculate.
※ Based on calendar days. Business days and holidays are not counted.
How to use
- Choose days between two dates, or add days to a date.
- Enter the start date.
- Enter the end date or the number of days to add.
- Press Calculate.
Key concepts: calendar days
The difference uses the browser calendar. Weeks are an approximation of days divided by 7. Business days, public holidays, and working days are not subtracted, so for contracts and shipping deadlines also check terms and a work calendar.
Example
If start and end dates are the same, the result is 0 days. That can differ from counting “N days including today,” so interpret inclusion according to your business rule.
Related: Character counter · Savings interest calculator · Keyboard tester
Frequently asked questions
Does the date calculator include today?
If start and end dates are the same, it is 0 days. That can differ from counting methods that include one day.
Are leap years and leap months applied?
The browser calendar is used, so leap years and month lengths are applied.
Are times included?
Only dates are used. Hours and minutes are not calculated.
Does it count business days only?
No. It is calendar days including weekends and public holidays.
How do I use this with savings or deposit terms?
Month counts in products take priority. For interest, use the <a href="/tools/savings-interest/">savings interest calculator</a> and the <a href="/tools/deposit-interest/">deposit interest calculator</a>.
Last reviewed: 2026-09-04