Days Since Calculator
Count how many calendar days have passed since an event, or how many days remain until an upcoming date.
✓ Free calculator ✓ Clear inputs ✓ Works in your browser
Days Since Calculator
Count days passed since a date — or days remaining until it.
Start Your Calculation
Free, instant and processed in your browser
Calculation Result
CalculatedHow to use the Days Since Calculator
- Choose the event date to measure from.
- Select a comparison date, or use today.
- Click Calculate to see how many calendar days have passed or remain.
How does this calculator work?
Dates are Gregorian calendar dates, parsed as calendar values rather than local midnights. The tool subtracts their UTC calendar-day positions, so daylight-saving transitions do not add or remove a day. A future event is displayed as days until; a past event as days since. The starting date is not counted in the elapsed-day difference.
Calculation example
From February 28, 2024 to March 1, 2024 is 2 calendar days because February 29 occurs in a leap year.
Frequently asked questions
Does it work for dates in the future?
Yes. The same calculation labels a future event as days until that date.
Does it count the starting date?
No. Two identical dates return zero days; the next calendar date returns one day.
Does the calculator handle February 29?
Yes, leap days are included in the total calendar-day difference.
Does it subtract holidays or weekends?
No. The result counts all calendar days and includes weekends and holidays.
Can I use my own comparison date?
Yes. Select any comparison date between 1600 and 9999, not only today.