What does this calculator calculate?
This calculator counts calendar days from the start date to the end date, excluding the start day. UTC calendar arithmetic avoids daylight-saving time shifts.
Worked examples
These examples use fixed sample inputs, separately from your current calculation. Displayed numbers are rounded.
South Korea units
- Start date
- 2026-10-03
- End date
- 2026-12-31
- Between dates
- 89 days
US units
- Start date
- 2026-10-03
- End date
- 2026-12-31
- Between dates
- 89 days
Frequently asked questions
Are both dates included?
The start day is excluded. October 3 to October 4 is one day; identical dates give zero. Add one to count both endpoints.
Are weekends and holidays excluded?
No. The result includes weekends and holidays. Country-specific business-day calculations are not provided.
Method and references
The displayed mathematical formula and input conditions apply. Results are rounded for display after internal calculation; check the assumptions for your use case.
Calculation methods, precision and data storage
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