python date time add or subtract

datetime package is very useful.

see the example code..

..

import datetime

print(datetime.datetime.now())

print(datetime.datetime.now().date())

lastHourDateTime = datetime.datetime.now() + datetime.timedelta(days = +10)

print(lastHourDateTime.date())

print(lastHourDateTime.time())

lastHourDateTime = datetime.datetime.now() + datetime.timedelta(hours = 10)

print(lastHourDateTime.date())

print(lastHourDateTime.time())

lastHourDateTime = datetime.datetime.now() + datetime.timedelta(hours = -10)

print(lastHourDateTime.date())

print(lastHourDateTime.time())

..

result

2021-07-08 10:19:44.969082

2021-07-08

2021-07-18

10:19:44.969146

2021-07-08

20:19:44.969164

Thank you.

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python year month day expression using datetime

Without any separator

import datetime
datetime.datetime.now().strftime("%Y%m%d%H%M%S")

Using - as separator

import datetime
datetime.datetime.now().strftime("%Y-%m-%d-%H-%M-%S")

Using _ as separator

import datetime
datetime.datetime.now().strftime("%Y_%m_%d_%H_%M_%S")