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How to Use
- 1Enter the start date in the first field.
- 2Enter the end date in the second field.
- 3Optionally enable "Include end date" to count the final day in totals.
- 4Review breakdown, totals, and business days (weekends excluded).
- 5Use "Swap Dates" or reset to today for quick adjustments.
About Date Difference Calculator
The Date Difference Calculator computes the exact duration between two dates with a full breakdown in years, months, and days, plus aggregate totals in weeks, hours, and minutes.
Business day calculation excludes Saturdays and Sundays, making it ideal for project timelines, contract durations, SLA tracking, and payroll period calculations. The optional end-date inclusion toggle lets you match either inclusive or exclusive counting conventions.
All calculations run locally in your browser. No dates or personal information are stored or transmitted to any server — safe for calculating sensitive project deadlines and legal timelines.
Frequently Asked Questions
How are business days calculated?
Business days exclude Saturdays and Sundays. Public holidays are not included in the calculation.
Can I enter dates in any order?
Yes. If the end date is before the start date, the calculator automatically swaps them.
What does "Include end date" change?
When enabled, the ending day is counted in totals. When disabled, calculations use the standard exclusive end-date approach.
What is the maximum date range supported?
Any date range is supported. Results are accurate for hundreds of years in either direction.
Does it account for leap years?
Yes. Leap years are fully accounted for, ensuring day counts are precise across any date range.