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Date Calculator - My Tools

Calculate the duration between two dates and add or subtract months and days from a base date online.

Date Calculator

Between two dates

Select a start and end date to calculate total days and calendar-based years, months, and days.

Duration summary
Total days
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Months + days
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Years + months + days
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Date before or after a base date

Add or subtract months and days from a base date to find the target date.

Calculated date

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Enter a base date and an offset to calculate.

How to use

  • In Between two dates, select the start and end dates, then click Calculate duration.
  • The duration is calculated as end date - start date. Selecting the same date shows 0 days.
  • In Date before or after a base date, enter the base date, direction, months, and days, then calculate.
  • Use the copy button below the result summary to save the text result to the clipboard.

Date calculation rules

Month offsets use calendar months; when the target month has no matching day, the date is adjusted to that month's last day.

This tool calculates calendar date differences and offsets only; it does not account for holidays or business days.