Question 1

Why calculate the gap between two dates?

Accepted Answer

Common uses include: how many days a contract has run, how late a payment is (for interest), how many days remain until an event, or how long a treatment or illness has lasted.

Question 2

How do days and months differ in the result?

Accepted Answer

Months are an imprecise unit (28–31 days). "Three months from 31 January" could land on different dates depending on the rule. This calculator counts months by the difference in calendar months, ignoring day-of-month. For exact figures like interest, use days rather than months.

Question 3

How do I count an inclusive range?

Accepted Answer

Decide whether the endpoints count. "From the 1st to the 10th, inclusive" is 10 days; counting only the gap between them is 9 days. Legal and financial terms often specify "inclusive" or start counting from the next day — check the exact wording.

Question 4

How are leap years handled?

Accepted Answer

February 29 exists only in leap years (divisible by 4, except century years not divisible by 400). 2024 and 2028 are leap years; 2100 is not. The calculator counts actual calendar days, so leap days are included automatically when the range spans one.

Question 5

Does it count business days or calendar days?

Accepted Answer

This calculator counts calendar days, including weekends and holidays. For working-day counts (excluding weekends and public holidays), use a dedicated business-day calculator with the relevant holiday calendar.

Date Difference Calculator — Free Online Calculator