Date & Time calculator
Date Difference Calculator
Calculate the number of days, weeks, months, and years between two dates.
Formula
Date difference method
Difference = end date - start date
From 1 January 2026 to 31 January 2026 is 30 elapsed days.
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?+
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?+
Calculate the number of days, weeks, months, and years between two dates.
How accurate is the Date Difference Calculator?+
Date Difference Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Date Difference Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
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.
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