Date Calculator
A live date span: days, calendar years, weekdays vs weekends - plus add or subtract any mix of years, months, weeks, and days.
Live
100 days
Live
Lands on
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Live
Lands on
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Date calculator
Count, add, or subtract days on any date
Find how many days lie between two dates, or jump forward and backward by years, months, weeks, and days - free, no sign-up.
How it works
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01
Pick a mode
Use Count Days for a span, Add Days to move forward, or Subtract Days to move back.
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02
Watch it update
Results recalculate as you type. Use presets (+7, +100, year end) or swap the two dates.
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03
Share the span
Copy a readable result or a link with #tab=, dates, and amounts in the hash.
Why use this date calculator?
Handy for deadlines, travel length, contracts, pregnancy weeks, and project buffers - without opening a spreadsheet.
What you can do
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Live hero
The span updates instantly - no Calculate click. A human phrase plus weekday mix.
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Weekdays vs weekends
See how many Mon-Fri and Sat-Sun days sit in the range (not holiday-aware).
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Add / subtract
Jump with chips (+7d, +1mo, +1y) or mix years, months, weeks, and days.
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Calendar months
Jan 31 + 1 month lands on Feb 28/29 - not a broken 31st.
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Shareable hash
Dates and tab live in #tab=&from=&to= so you can send the exact view.
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Private by default
No account. Everything runs in this browser.
Frequently asked questions
Yes. It is free to use in the browser with no account required.
Without it, Jan 1 to Jan 11 is 10 days. With it, both days are counted (11). Useful when you need an inclusive day count.
We use calendar months and clamp the day when needed (January 31 plus one month lands on the last day of February).
Dates are treated as local calendar dates on your device - there is no time-of-day, so DST does not shift the day count.
Yes. Use #tab=add-dates or #tab=subtract-dates in the URL.
No. The weekday mix splits Mon-Fri vs Sat-Sun on the calendar - it does not skip public holidays. For holidays by country, use the year or week calendar tools.