Date Calculator
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Hours and minutes between two times.
Working days minus weekends.
Exact age in years, months, days.
Three date tools in one page
Days between dates — exact duration with years/months/days, weeks and business days. Add/subtract — what date is 90 days from now? Days from today — how long until (or since) any date. Every result shows the weekday too.
How business days are counted
Business days are Monday to Friday, excluding weekends. The count walks day by day from the start date: each Saturday or Sunday is skipped, everything else counts. Include the end date and a Friday-to-Monday span counts 2 business days (Friday and Monday); exclude it and it counts 1 (Friday only). Public holidays are not subtracted automatically — adjust the total manually if your count needs them.
Worked example
Days between Monday 5 January 2026 and Friday 16 January 2026, end date included: calendar days = 16 − 5 + 1 = 12. Weekends inside: Sat 10 – Sun 11 Jan = 2 days. Business days = 12 − 2 = 10. Excluding the end date: 11 − 2 = 9 business days. Try it in the calculator — both answers match.
End date: in or out?
1 Jan → 2 Jan is 1 day apart, but some counts (hotel nights, challenges) include both ends. The checkbox lets you choose — most calculators force one way.
Frequently asked questions
Should I include the end date?
For 'how many days between' usually NOT — 1 Jan to 2 Jan is 1 day. Tick the box for hotel-night style counts where both endpoints count.
How are business days counted?
Monday–Friday only, weekends skipped. Public holidays aren't subtracted automatically — use the Business Days Calculator for holiday-aware counts.
Adding months — what happens on 31 January + 1 month?
JavaScript rolls over: 31 Jan + 1 month = 3 Mar (Feb has no 31st). For exact month arithmetic, check the result date shown.
Why do I need the weekday?
Deadlines, deliveries and events are weekday-sensitive. We show it for every date so you never book a Sunday by accident.