Days since and until

How the count works

The counter takes today’s date from your device and counts whole calendar days to the date you choose: days until for a future date, days since for a past one. By default it counts the way you would on a calendar, from tomorrow up to and including the target day, so 1 to 3 March is 2 days. Tick Count both the first and the last day when you need both ends, for example for a 5-day course that runs Monday to Friday.

Months are calendar months: from 15 January to 15 March is 2 months. When the start day does not exist in the end month, the last day of that month completes the month, so 31 January to 28 February counts as 1 month. Weekdays counts Monday to Friday in the same span and ignores public holidays, which differ from place to place.

Leap years and clock changes

The arithmetic is done on calendar dates, never on hours, so a daylight-saving change cannot nudge a count by a day, and 29 February is counted only in leap years (every fourth year, except century years not divisible by 400: 2000 was a leap year, 2100 will not be). Saved counters recalculate from your device’s date each time you open the page.