Find the exact number of days between two dates, or add or subtract days, months, and years, with an option to exclude weekends.
Excludes Saturdays and Sundays from the total
Treats the end date as a full active day
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The Gregorian calendar was introduced in 1582 to correct inaccuracies in the older Julian calendar. By refining leap year rules, it more closely matches the Earth’s orbital period and helps keep seasons aligned with calendar dates over long periods.
A leap year adds an extra day to February to keep the calendar synchronized with Earth’s orbit around the Sun. Most years divisible by 4 are leap years, except century years unless they are also divisible by 400.
Date calculations are used for project planning, payroll processing, age calculations, contract durations, subscription renewals, and countless other real-world applications that depend on accurate time measurement.
Calendar days include every day of the week, while business days typically exclude weekends and sometimes public holidays. Understanding the difference is important when calculating deadlines, shipping estimates, and work schedules.
Quick answers about how this tool works.
Yes. Date calculations automatically account for leap years, including the extra day in February when applicable, ensuring accurate results across different years.
Standard date calculations include all calendar days. Some advanced date calculators may offer business-day calculations that exclude weekends and optionally account for public holidays.
Yes. You can add a specific number of days, weeks, months, or years to a starting date to determine a future date for planning events, deadlines, contracts, or schedules.
Months contain different numbers of days, ranging from 28 to 31. As a result, adding or subtracting months may produce different day counts than adding a fixed number of days.
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