How are months counted?

Full calendar months between the same day-of-month, with remainder days shown separately.

Does workdays mode skip public holidays?

No — it follows the weekend mask you choose. Public holidays vary by country, so exclude specific dates manually.

Does the duration tab handle times that cross midnight?

Yes — if the end time is earlier than the start, the duration assumes the next day.

Can I share a calculation?

Yes — the URL captures your mode and dates. Send the link and the recipient sees the same result.

Date & Time Calculator

Date diff, duration, workdays, age, countdown & reverse

Quick answer: Pick a tab — Date diff, Duration, Age, Workdays, Countdown or Reverse — to handle any date or time question.

How to use Date & Time Calculator

Open the tab that fits your question (Date diff, Duration, Age, Workdays, Countdown or Reverse).
Pick the dates or times — natural phrases like "today" or "next monday" work too.
Toggle “Include time of day” for hour/minute precision in date diffs.
Copy the result, share the URL or export as CSV.

FAQs

How are months counted?: Full calendar months between the same day-of-month, with remainder days shown separately.
Does workdays mode skip public holidays?: No — it follows the weekend mask you choose. Public holidays vary by country, so exclude specific dates manually.
Does the duration tab handle times that cross midnight?: Yes — if the end time is earlier than the start, the duration assumes the next day.
Can I share a calculation?: Yes — the URL captures your mode and dates. Send the link and the recipient sees the same result.

About Date & Time Calculator

Six calculators in one tool: Date diff (years/months/days between two dates), Duration (hours and minutes between two clock times), Age (years/months/days from a birth date), Workdays (business days with custom weekend mask), Countdown (live ticking clock to any future date) and Reverse (add/subtract a duration from a date). Smart natural-language inputs ("today", "next monday") supported.