Date Calculator
Compare calendar dates, or move a date forward and backward. Calendar days are not elapsed 24-hour periods.
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How this calculator works
Day counting includes exactly the endpoints you select. Equal dates count once only when both endpoints are included. Backward intervals show a negative count. Calendar years/months/days are also shown as a separate, unsigned calendar difference. Adding months keeps the same day where possible and otherwise clamps to month end.
Calculations stay on your device. Empty or invalid inputs produce an explicit error. Interactive results require JavaScript.
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Save on this device, or copy settings into a link. Shared links contain your inputs; share only the details you intend.