Days Between Dates Calculator
Enter two dates for the exact difference in days, weeks, months and weekdays.
How this is calculated
ZenCountdown counts full calendar days between your two dates using UTC calendar math, so results are unaffected by daylight-saving shifts. Toggle "count both dates" to switch between an exclusive difference (nights between two dates) and an inclusive one (total days spanned, useful for trip length or rental periods).
Common reasons people count days between two dates
This calculator gets used for project deadlines, contract terms, pregnancy due dates, rental or lease periods, and anniversaries. It counts full calendar days between the two dates you enter and breaks the result down into weeks and months too, so you're not left doing the division by hand.
Frequently asked questions
Does the calculator count the start and end date?
It counts the number of full days between the two dates — if you pick January 1 and January 10, that's 9 days between them, not 10.
Can I calculate business days only, excluding weekends?
Use the dedicated Business Days Calculator for that — it excludes Saturdays and Sundays automatically, which this general date-difference tool does not.
What's the difference between this and Add/Subtract Days?
This tool answers "how far apart are these two dates?" The Add or Subtract Days tool answers the reverse question: "what date is N days from this one?"