How to convert string into time

In python, convert dates, times, and strings to each other.

(1) DateTime can be converted to date, but date cannot be directly converted to dateTime

import datetime
dateTime_p = datetime.datetime.now()  
date_p = dateTime_p.date() 
print(dateTime_p) #2019-01-30 15:17:46.573139
print(date_p) #2019-01-30

(2) Date type date is converted to string str

#!/usr/bin/env python3
import datetime
date_p = datetime.datetime.now().date()
str_p = str(date_p)
print(date_p,type(date_p)) #2019-01-30 <class &#39;datetime.date&#39;>
print(str_p,type(str_p)) #2019-01-30 <class &#39;str&#39;>

(3) Convert string type str to dateTime type

import datetime
str_p = '2019-01-30 15:29:08'
dateTime_p = datetime.datetime.strptime(str_p,'%Y-%m-%d %H:%M:%S')
print(dateTime_p) # 2019-01-30 15:29:08

(4) Convert dateTime type to str type

import datetime
dateTime_p = datetime.datetime.now()
str_p = datetime.datetime.strftime(dateTime_p,'%Y-%m-%d')
print(dateTime_p) # 2019-01-30 15:36:19.415157

(5) Convert string type str to date Type

#!/usr/bin/env python3
import datetime
str_p = '2019-01-30'
date_p = datetime.datetime.strptime(str_p,'%Y-%m-%d').date()
print(date_p,type(date_p)) # 2019-01-30 <class &#39;datetime.date&#39;>

In addition, the dateTime type and date type can directly perform operations such as adding 1 and subtracting 1

#!/usr/bin/env python3
import datetime
# today = datetime.datetime.today()
today = datetime.datetime.today().date()
yestoday = today + datetime.timedelta(days=-1)
tomorrow = today + datetime.timedelta(days=1)
print(today) # 2019-01-30
print(yestoday)# 2019-01-29
print(tomorrow)# 2019-01-31

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