All tools · Date and time tools

Date Calculator

Days between dates, or add/subtract days from a date.

Free to use, no sign-up required. Date Calculator is one of 198 tools built into Xenition, alongside a chat that can use them for you.

Counts the days between two dates, or finds the date a given number of days before or after a start date.

How to use Date Calculator

  1. Choose Days between or Add days.
  2. Pick a Start date.
  3. For Days between, pick an End date. For Add days, type the Days to add, using a minus sign to go backwards, such as -14.
  4. Read the Difference in days, or the Result date with its weekday.

How it works

Days between subtracts the two calendar dates and shows the result as a positive number of whole days, whichever date comes first. The start date itself is not counted, so consecutive days are 1 day apart. Add days moves the calendar forward or back by that many days, handling month lengths and leap years.

Example

From 1 January 2026 to 25 December 2026 is 358 days. Adding 90 days to 27 September 2026 gives Saturday 26 December 2026, and subtracting 14 days from 15 March 2026 gives Sunday 1 March 2026.

Questions about Date Calculator

Should I add 1 to include both the start and end dates?

Yes, if you want an inclusive count such as the number of days in a booking that covers both dates. The tool gives the gap between the dates, so add 1 for an inclusive total.

Does it count only working days?

No. Every calendar day is counted, including weekends and public holidays.

Use it from chat

You do not have to open Date Calculator to use it. Ask Xenition in plain language and it runs the right tool, then carries the answer into whatever you are working on — a document, a spreadsheet, a deck.

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