Count Days Between Dates, or Add Time to a Date
Switch between two modes: find exactly how many days lie between two dates, or add/subtract days, weeks, months, or years from a date to see the resulting date and weekday. All calculations are done on calendar dates only, so results stay correct regardless of your device's time zone or daylight saving changes.
📆 Great For
- Counting the exact number of days until a deadline
- Finding what date it'll be 90 days from today
- Working out a due date by adding weeks to a start date
- Checking which day of the week a future date falls on
📋 How to Use
- Choose "Date Difference" or "Add / Subtract" at the top
- Pick your dates, or an amount and unit
- The result updates automatically
- Press "Copy result" to copy it as text
Frequently Asked Questions
Does the day count include the start and end date?
The result is the number of full days between the two dates (end date minus start date). For example, January 1 to January 3 is 2 days.
Can I subtract time instead of adding it?
Yes. In "Add / Subtract" mode, use the + / − toggle next to the base date to choose the direction before entering the amount.
Will daylight saving time cause an off-by-one-day error?
No. All calculations use calendar dates only, not clock time, so daylight saving changes and time zones never shift the result by a day.
How are months and years added?
Adding months or years keeps the same day of the month where possible. If that day doesn't exist in the target month (e.g. January 31 + 1 month), the last day of that month is used instead.