Date Calculator
Days between dates, add or subtract
Everything runs locally in your browser — nothing is sent to our servers.
How to use Date Calculator
- 1
Enter your numbers
Type values or an expression — decimals and negatives are fine.
- 2
Pick a mode
Scientific, finance, dates, statistics, graphing and more, all in one place.
- 3
Read the result
Answers update as you type, with the formula's assumptions spelled out.
Frequently asked questions
Is Date Calculator free?
Yes — completely free, with no signup and no watermarks. PL Tools is supported by a small number of non-intrusive ads.
Is anything I type sent anywhere?
No. Every calculation runs in your browser; nothing is uploaded or stored.
How precise are the results?
Standard double-precision arithmetic (about 15 significant digits), shown rounded. Finance results are estimates from the formula stated on screen — lenders and funds may round or charge differently.
Does it work on my phone?
Yes. PL Tools works in any modern browser on iPhone, Android, tablets and desktop — there's nothing to install.