About datecalculator.site

datecalculator.site was built to be a fast, accurate, and distraction-free way to do date math — finding the number of days between two dates, adding or subtracting time from a date, and quickly answering questions like "what date is 90 days from today."

Every calculation runs locally in your browser. No dates you enter are sent to or stored on our servers — see the privacy policy for details.

How the calculations work

Date math accounts for the actual Gregorian calendar — variable month lengths, leap years, and the ambiguity of operations like "add one month" to a date near the end of a month. We document these conventions on each tool page so results are predictable, not a black box.

Who's behind this

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Questions, feedback, or found a bug? Get in touch.