如何計算 HH:MM:SS 格式的兩個字串之間的時間間隔？

Calculating the Time Interval Between Two Strings

Determining the time difference between two strings in HH:MM:SS format can be a useful task for various applications. Using Python's datetime and time modules, this computation can be efficiently performed.

To parse the strings into datetime objects, employ the datetime.strptime() method. Then, calculate the time difference using the subtraction operator (-) between the parsed datetime objects. This yields a timedelta object containing the difference.

from datetime import datetime

s1 = '10:33:26'
s2 = '11:15:49'
FMT = '%H:%M:%S'

tdelta = datetime.strptime(s2, FMT) - datetime.strptime(s1, FMT)

To convert the timedelta to seconds for averaging, utilize the total_seconds() method. Then, compute the average by summing the seconds and dividing by the number of intervals.

total_seconds = tdelta.total_seconds()
avg_seconds = total_seconds / number_of_intervals

For scenarios where the end time precedes the start time, adjustments may be required to ensure the interval calculation assumes the crossing of midnight. Consider the following code snippet:

if tdelta.days < 0:
    tdelta = timedelta(
        days=0,
        seconds=tdelta.seconds,
        microseconds=tdelta.microseconds
    )

By employing this approach, you can effectively determine the time interval between two time strings and perform further computations like averaging.

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