Date Duration Calculator
Diff dates, add/subtract durations, or countdown — with totals, business days, and copy-ready code snippets.
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Result
Target is in the past.
Breakdown
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days
weeks
hours
minutes
seconds
business days
Business days count Mon–Fri only; public holidays are not excluded. Day-level diffs across DST boundaries can differ from raw millisecond totals — calendar fields above use local date parts.
Code snippets
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About this tool
Calendar diffs, duration math, and countdowns — with honest notes about DST and business days. Snippets cover vanilla Date, date-fns, and Temporal.
Runs in your browser. Dates sync to the URL for sharing.
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