![]() Round your last result to the nearest integer: it corresponds to the seconds field.Take the decimal part of that result and multiply it by 60 and.Take the integer part of the new result: it corresponds to the minutes field.Take the decimal part of the result and multiply it by 60.Take the integer part of the result: it corresponds to the hours field.Convert your time to hours (using the 3 rd equation above).If you need to convert from one of the decimal time forms (hours, minutes, or seconds) to the hrs:min:sec form, you can do so with the following steps: If you need to convert from this form to one of the others (hours, minutes, or seconds), you can take each field of the hrs:min:sec time and convert it to the required unit (using the above equations), then add up the results. When it comes to the hour:minute:second time conversion, things get a bit more complicated. time in hours = time in minutes / 60 = time in seconds / 3600.time in minutes = time in seconds / 60 = time in hours × 60.time in seconds = time in minutes * 60 = time in hours × 3600.In this case, the minute digits 30 are associated with the quantity one half.Ĭonverting between hours, minutes, and seconds using decimal time is relatively straightforward: However, for time measurements, we often use the hour:minute:second notation in which one and a half hours is equal to 1 h 30 min. For example, when we say "one and a half" or "1.5" liters of water, we associate the first decimal digit 5 with the quantity one half. Time conversion between hours, minutes, and seconds can be intuitively tricky because of the fundamental difference between the way we partition time units, and the decimal system that we use to partition most other numbers. How to convert between hours, minutes, and seconds? And for shorter events, we can use the millisecond (1/1000 second), the microsecond (1/1000 millisecond), or the nanosecond (1/1000 microsecond). For longer time measurements, we can use the day (= 24 hours), the week (= 7 days), the month (around 30 days), or the year (around 365 days). Naturally, the hour, minute, and second are not the only time units. The later formal definition of the SI units of time uses the second as the base unit and defines it precisely as " The duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom." Historically, the Earth's rotation cycle was used to define the hour, the minute, and the second such as one full rotation takes 24 hours or 24 * 60 = 1,440 minutes or 1440 * 60 = 86,400 seconds. ![]() But what came first? The hour, the minute, or the second? And how are they defined? We've all used the hour as a unit of time, and we know that one hour is equal to 60 minutes, and one minute is equivalent to 60 seconds.
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