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Time Add/ Subtract Calculator

Our online tools will provide quick answers to your calculation and conversion needs. On this page, you can count any number of hours or minutes from a given time. Get answer to questions like "what time will it be if you were to add two hours and forty minutes to the current time?"

Enter time as hh:mm e.g., 03:30 AM

Time:

hh mm

To find time duration between two time values in hours, minutes and seconds, use our time interval calculator.

Android: Use this time calculator offline with our all-in-one calculator app.

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Time Arithmetic

Before we start the calculation, we convert the time value to 24-hour format.

Steps for adding time

Add the hours and the minutes separately. If the minutes are >= 60, subtract 60 from the minutes and add 1 to hours. If the hours are >= 24, set hours to "hours mod 24".

Steps for time subtraction

Subtract the hours and the minutes separately. If the minutes are <= 0, add 60 to the minutes and subtract 1 from hours. If the hours are <= 0, add 24 and set it to "hours mod 24".

Convert the time back to 12-hour format at the end of calculation.

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