Date & Time calculator
Date Difference Calculator
Calculate the number of days, weeks, months, and years between two dates.
FormulaDifference = end date - start date
Formula
Date difference method
Difference = end date - start date
From 1 January 2026 to 31 January 2026 is 30 elapsed days.
FAQ6 common questions for this calculator.
FAQs
Does this include the end date?+
It shows elapsed days between dates. For inclusive counting, add one day to the result.
Can I calculate past date ranges?+
Yes. You can compare any two valid dates.
How does the Date Difference Calculator calculate the result?+
For the Date Difference Calculator, it uses the Date difference method: Difference = end date - start date. From 1 January 2026 to 31 January 2026 is 30 elapsed days.
What information do I need to use the Date Difference Calculator?+
For the Date Difference Calculator, enter the relevant dates, times, timezone, or calendar settings requested by the form. Exact dates matter because month lengths, leap years, and boundary days can change the result.
How accurate is the Date Difference Calculator?+
Date Difference Calculator is accurate for the values and assumptions entered on this page. It uses the Date difference method. Recheck the inputs before relying on the estimate.
What should I check before using the Date Difference Calculator result?+
For the Date Difference Calculator, check the date and time fields, date format, timezone, daylight-saving changes, inclusive or exclusive endpoints, and whether weekends or holidays should count.
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Date & Time guide
How to use the Date Difference Calculator
Calculate the number of days, weeks, months, and years between two dates. The page also explains the date difference method and shows a practical example: From 1 January 2026 to 31 January 2026 is 30 elapsed days.
- 1
Enter your details
Enter the values for the date difference calculator scenario you want to check.
- 2
Check the calculation
Review the result alongside the date difference method: Difference = end date - start date.
- 3
Compare scenarios
Change one or more inputs to see how they affect the date Difference Calculator result before you use the estimate.