Calculators & Converters
Date calculator
Three jobs in one: how many days between two dates, what date is it after adding time, and what is the due date after N working days.
- Free, no sign-up
- Runs in your browser
- Nothing uploaded
Question
What do you need?
Dates
Direction
For example a "pay within 15 working days" term.
Business days (optional)
One date per line, as YYYY-MM-DD.
Result
Table
How it works
Dates are compared as calendar days, so time zones and daylight saving never change the answer. Adding months keeps the day of the month and clamps to the last day when the month is shorter, so 31 January plus one month is 28 February (29 in a leap year).
A business day is any day that is not on your chosen weekend and not in your holiday list. There is no built-in holiday calendar because public holidays differ by state, bank and year. Paste the ones that matter to you.
Frequently asked questions
How do I work out a payment due date for "net 30"?
Use "Add or subtract", start at the invoice date and add 30 days.
Does "between" count the first day?
It counts the difference, so 1 June to 2 June is 1 day. Tick "include the end date" to count both days, as for a leave request.
Is anything sent anywhere?
No. It all runs in your browser.