python 日期、时间、字符串相互转换(转载)
原文链接:https://www.cnblogs.com/huhu-xiaomaomi/p/10338472.html
在python中,日期类型date和日期时间类型dateTime是不能比较的。
(1)如果要比较,可以将dateTime转换为date,date不能直接转换为dateTime
import datetimedateTime_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)日期类型date转换为字符串str
#!/usr/bin/env python3
import datetimedate_p = datetime.datetime.now().date()
str_p = str(date_p)
print(date_p,type(date_p)) #2019-01-30 <class 'datetime.date'>
print(str_p,type(str_p)) #2019-01-30 <class 'str'>
(3)字符串类型str转换为dateTime类型
import datetimestr_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)dateTime类型转为str类型
这个地方我也不太理解,为什么指定格式无效
import datetimedateTime_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)字符串类型str转换为date类型
#!/usr/bin/env python3import 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 'datetime.date'>
另外dateTime类型和date类型可以直接做加1减1这种操作
#!/usr/bin/env python3import 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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