CALCULATORS
Count the days between two calendar dates.
Measure a date span in whole calendar days. Choose whether to count both endpoints, and see the corresponding weeks and remaining days.
No account needed. Files and inputs stay on your device.
Date difference calculator
A CLEAR WORKFLOW
How to use RSDateSpan
- 01
Choose a start date.
- 02
Choose an end date on or after the start.
- 03
Choose inclusive or exclusive counting.
- 04
Calculate and review the convention shown.
WORKED EXAMPLE
A practical starting point
October 1 to October 4 is a three-day difference. Counting both calendar dates inclusively gives four days.
Before you download
Does daylight saving time change the answer?
No. The calculation uses calendar dates on a UTC day scale, rather than local elapsed hours.
Is this a business-day calculator?
No. Weekends and public holidays are included.
Can I use it for a legal deadline?
Do not rely on it for legal rules. The tool counts dates and does not apply jurisdiction-specific deadline conventions.
USEFUL READING