Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Add a duration (hours and minutes) to a starting time.
Enter a starting time to see the result.
This tool adds a duration -- in hours and minutes -- to a starting clock time, and shows the resulting time (rolling over past midnight into the next day when needed).
Enter a starting time, then the hours and minutes to add. The resulting time appears instantly.
The starting time is converted to minutes after midnight. The hours you enter are multiplied by 60 and added together with the minutes, and the sum is added to the starting value. The total is then wrapped around a 24-hour clock and displayed in 12-hour format with AM or PM, for example 3:45 PM. Empty hours or minutes fields are treated as zero, so you can add hours only or minutes only. Minutes above 59 are accepted, so entering 90 minutes works the same as 1 hour and 30 minutes.
Result = (start minutes + hours x 60 + minutes) wrapped to a 24-hour day
All values below are hypothetical.
The result is a clock time with no date and no marker such as "next day." If you add a duration that crosses midnight, you have to notice this yourself. A quick way is to check whether the result is earlier on the clock than your starting time; if it is, you have passed midnight at least once. For durations longer than 24 hours, the number of days elapsed is the total added minutes divided by 1,440, rounded down. If you need the resulting date as well, combine this tool with the Date After Days Calculator.
Yes -- if adding the duration rolls past midnight, the result correctly wraps to the next day's time.
No. It displays only the clock time. If the result is earlier than the start, or you added 24 hours or more, the time has passed midnight at least once.
Yes. The minutes are converted to total time, so 90 minutes adds the same as 1 hour 30 minutes.
A full day brings the clock back to the same reading. The tool does not display the day count.
No. It assumes everything is on one clock, so convert to a common time zone first if you need to combine them.
Reference: U.S. Department of Labor