About the Date Difference Calculator
Date Difference reports both fixed elapsed days and human calendar units. UTC date-only arithmetic prevents local daylight-saving hours from changing the day count.
How to use the Date Difference Calculator
- Choose start and end dates.
- Decide whether both boundary dates should count.
- Calculate and use the elapsed or calendar result that fits the task.
Practical tips
- Inclusive counting adds one day to include both endpoints.
- Calendar months are not fixed numbers of days.