Python check whether `datetime` is the beginning of the day?-CodePudding

For type datetime.datetime, how do we check whether the timestamp points to the beginning of the day?

The beginning of the day means the time 00:00:00.000000 of the day, while the date part can be anyone.

CodePudding user response：

Use datetime.time.min to get the earliest possible time (the beginning of the day) and compare it to your_datetime.time()

your_datetime.time() == datetime.time.min

CodePudding user response：

Something like this will take care of it. In this example I am comparing with the current time. datetime.time() with no arguments is initialised to (0,0).

datetime.time() == datetime.datetime.now().time()

CodePudding user response：

One way is to format the datetime using "%H:%M:%S.%f" and check if the value is "00:00:00.000000".

from datetime import datetime

d1 = '2022-10-27T05:23:20.000000'
d2 = '2022-10-27T00:00:00.000000'

fmt = "%Y-%m-%dT%H:%M:%S.%f"
dt1 = datetime.strptime(d1, fmt)
dt2 = datetime.strptime(d2, fmt)

print(dt1, dt1.strftime("%H:%M:%S.%f") == "00:00:00.000000")
print(dt2, dt2.strftime("%H:%M:%S.%f") == "00:00:00.000000")

Output:

2022-10-27 05:23:20 False
2022-10-27 00:00:00 True

Another way is check if the time fields in a datetime object are all 0.

if dt2.hour == dt2.minute == dt2.second == dt2.microsecond == 0:
    print("dt at beginning of the day")