How to use the Date Difference Calculator
Find the signed number of days and calendar interval between two dates. Enter the requested values, review their units, and select Calculate. The result panel shows both the answer and the substituted steps.
The formula
difference = end date − start date
Frequently asked questions
Is the end date included?
The total is the number of midnight boundaries between the dates. Consecutive dates are one day apart.
Can the result be negative?
Yes. A negative total means the end date is earlier than the start date.
Important notes
Results are estimates based on the values supplied and the formula shown. Round only at the end of a calculation, and verify safety-critical, medical, financial, or construction decisions with an appropriate professional.