and the string conversion between datetime python

A, datetime generation

from datetime import datetime
# 当时时间
now=datetime.now()
# 指定时间
test=datetime(2020,1,26,11,11,11)

Two, datetime to String

• str strong turn type

str(datetime(2020,1,3))

• strftime: based on the incoming format

datetime.now().strftime('%Y-%m-%d')

Third, the switch string datetime

• strptime: parsing format known time

datetime.strptime('1/26/2021','%m/%d/%Y')

• dateutil.parse can resolve almost all human beings can understand date representation

from dateutil.parser import parse
parse('2020-01-03')
parse('Jan 31, 2021 10:45 PM')

Four, datetime time difference calculating

timedelta: represents the difference between the two datetime (date, seconds, milliseconds)

# datetime相减
datetime(2019,1,7) - datetime(2021,6,24,8,15)
# datetime加timedelta
datetime(2021,1,7)+timedelta(12)