Date Difference Calculator
Intro
This calculator shows the total days between two dates, the inclusive date span, weekday and weekend counts, and an exact calendar difference in years, months, and days. It is useful for planning deadlines, tracking project durations, checking age-like intervals, and comparing date ranges without business-day filters.
How it works
The page converts both dates into UTC date-only values, then measures the calendar span in two ways:
- absolute day difference using date arithmetic
- exact calendar difference using stepwise year and month matching
Limitations: this page measures calendar dates only. It does not include time-of-day, business calendars, public holidays, or legal deadline rules that may depend on local cutoff times.
Practical use scenarios
- Count days between project milestones or travel dates.
- Check how long a contract, course, or event period lasts.
- Compare total days with exact calendar components.
- Use it as a general "days between dates" tool before switching to business-day logic.
Related tools
FAQ
Total days measures the gap between the two dates. Inclusive days counts both the start date and the end date as part of the span.
This page measures all calendar days. The business days calculator excludes weekends and optional holiday calendars.
Yes. Leap years are handled naturally by date arithmetic.
Use it for planning only. Formal deadlines may follow jurisdiction-specific rules.