Date Calculator
Calculate days between dates, add or subtract days, or switch to the workday basis to count business days and find the date N workdays away.
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Calculate days between dates, add or subtract days, or switch to the workday basis to count business days and find the date N workdays away.
About the date calculator
Add time or compare moments
Use Add time to move a starting date and time forward or backward by days or hours. Use Difference between dates to compare two moments. The calculation basis switch decides whether results count every calendar day or workdays only.
Workday basis and exclusions
Under the workday basis, your weekly days off and custom excluded dates are skipped — ideal for questions like what date is 10 business days later. Days off default to Saturday and Sunday; tap the weekday keys to match your region, such as Friday and Saturday. Workday totals are not based on a regional public holiday calendar; add holidays manually by tapping them on the calendar.
Shareable URL and calendar view
The page keeps the current mode, dates, times, filters, and exclusions in the URL query, so you can reopen or share the same calculation. The calendar highlights the base, target, start, end, range, and excluded dates, and the result can be copied.
FAQ
Common questions and answers about this topic.
How do I calculate business days between two dates?
Switch the calculation basis to "Workdays" and use "Difference between dates" mode. The result shows workdays with weekends and your excluded dates skipped — the start day counts, the end day does not, so move the end date one day later if you want it included.
Can I exclude holidays from the calculation?
Yes. Under the workday basis, tap a day on the calendar to exclude it (Shift-click or long-press another day to exclude a whole stretch). Excluded dates are skipped together with your weekly days off in both add-time and difference calculations.
What is the difference between calendar days and working days?
Calendar days count every day including weekends and holidays. Workdays exclude your weekly days off (Saturday and Sunday by default, adjustable) and your excluded dates. Use the calculation basis switch above the tool to choose which one the results use.
How do I subtract days from a date?
In "Add time" mode, click the "Backward" direction toggle. Enter your starting date and the number of days or hours to subtract. The result will show the date in the past.
How do I find the date 10 business days from today?
Switch the calculation basis to "Workdays", use "Add time" mode, and enter your start date with an amount of 10 days. The stepping skips weekends and your excluded dates and lands on the exact date. It also works with hours for workday-hour deadlines, and backward to count workdays into the past.