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Date calculator online tool showing a starting date and calculated future or past date

Date Calculator

Work out dates and the time between them.

Add or subtract time

How to Use the Date Calculator in 5 Steps

  1. 1

    Enter the starting date.

    Choose the date you want to adjust.

  2. 2

    Choose the supported time unit and amount.

    Select how much time to add or subtract.

  3. 3

    Select add or subtract.

    Pick the direction of the change.

  4. 4

    Run the calculation.

    Process the date with the tool.

  5. 5

    Review the resulting date.

    Confirm the calculated date fits your plan.