Date & Time Calculator (Start Time + Elapsed Time)

Add or subtract days, hours, and minutes from a start date and time to find the resulting date and time, with the day of the week.

Input

Start date

YYYY/MM/DD

Start time

Days

days

Hours

hrs

Minutes

min

Enter a start date and time, then the amount of time to add (or subtract).

Pick a start date and time, enter the days, hours, and minutes to add, and the resulting date and time is shown along with the day of the week.
Use the toggle to switch between After (add) and Before (subtract), so you can calculate not only future dates but also times in the past.
The days, hours, and minutes you enter are also converted into total hours and total minutes, so you can quickly see how long the span is overall.
Calculations that cross day boundaries are supported: when the time passes midnight, it automatically rolls over to the next day and beyond.
The result is shown as a calendar date (YYYY/MM/DD) with a 24-hour time, and the day of the week is included.
Daylight saving time and leap seconds are not taken into account. The tool treats this as a simple addition or subtraction of calendar dates and times.

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