Days Calculator
Count the signed number of days between two calendar dates.
Make this result useful
Use it now, or keep a copy for later. We never save your tool input automatically.
How to use this tool
Choose a start date and an end date, then select Calculate. The start date is not counted as a completed day.
Important to know
Count the signed number of days between two calendar dates.
Dates are interpreted as UTC calendar dates. Reverse the dates to see a negative result. This is elapsed days, not business days.
Formula and methodology
Days = (end date at 00:00 UTC − start date at 00:00 UTC) ÷ 86,400 seconds.
Example
From 1 January to 11 January there are 10 elapsed days.
Frequently asked questions
Does the calculator include the start date?
No. It reports elapsed days between the two dates.