How to compare two time points in python

How to compare two time points in python? Let me explain the specific steps below:

1. Convert string to datetime

#字符串转datetime
dt = datetime.datetime.strptime('2017-04-19 00:42:44','%Y-%m-%d %H:%M:%S')

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2. Convert datetime to string

#datetime转字符串
str = dt.strftime("%Y-%m-%d-%H")

3.Comparison of datetime

>>> dt1 = datetime.datetime.strptime('2017-04-18 00:40:00','%Y-%m-%d %H:%M:%S')
>>> dt2 = datetime.datetime.strptime('2017-04-18 00:20:00','%Y-%m-%d %H:%M:%S')
>>> print(dt1 - dt2)
0:20:00
>>> print(dt2 - dt1)
-1 day, 23:40:00

It can be seen that when subtracting a larger time from a smaller time, the result is -1 Day, 23:40. Instead of -20 points.

4. Judgment of datetime comparison results

>>> diff = dt2 - dt1
>>> print(diff)
-1 day, 23:40:00
>>> print(diff.days)
-1
>>> print(diff.seconds)
85200

That is, diff.days should be used for comparison. If it is less than 0, the former is smaller.

5. The specific difference in seconds

>>> diff.days * 86400 + diff.seconds
-1200

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