1. datatime
from datetime import datetime, date
now = datetime.now()
print(now) # 2020-01-20 01:24:01.843183
to = date.today()
print(to) # 2020-01-20
print(datetime(2000, 1, 1, 1, 0, 0)) # 2000-01-01 01:00:00
delta = now - datetime(2000, 1, 1, 1, 0, 0)
print(now, type(now)) # 2020-01-20 01:24:01.843183 <class 'datetime.datetime'>
print(now.date()) # 2020-01-20
print(now.time()) # 2020-01-20
print(delta) # 7324 days, 0:24:01.843183
print(delta.days) # 7324
1.1 strptime
from datetime import datetime
S=datetime.strptime('2019/07/07','%Y/%m/%d')
print(S,type(S))
S=datetime.strptime('2019年7月7日星期日','%Y年%m月%d日星期日')
print(S,type(S))
S=datetime.strptime('2019年7月7日星期日8时42分24秒','%Y年%m月%d日星期日%H时%M分%S秒')
print(S,type(S))
S=datetime.strptime('7/7/2019','%m/%d/%Y')
print(S,type(S))
S=datetime.strptime('7/7/2019 8:42:50','%m/%d/%Y %H:%M:%S')
print(S,type(S))
#结果：
2019-07-07 00:00:00 <class 'datetime.datetime'>
2019-07-07 00:00:00 <class 'datetime.datetime'>
2019-07-07 08:42:24 <class 'datetime.datetime'>
2019-07-07 00:00:00 <class 'datetime.datetime'>
2019-07-07 08:42:50 <class 'datetime.datetime'>
1.2 strftime
dt=datetime.now()
s=dt.strftime('%m/%d/%Y %H:%M:%S %p')
print(s,type(s))
s=dt.strftime('%A,%B %d,%Y')
print(s,type(s))
txt =('%s年%s月%s日星期%s %s时%s分%s秒'%(dt.strftime('%Y'),dt.strftime('%m'),dt.strftime('%d'),<br>dt.strftime('%w'),dt.strftime('%H'),dt.strftime('%M'),dt.strftime('%S')))
print(txt)
s=dt.strftime('%B %d,%Y')
print(s,type(s))
结果：
07/07/2019 14:57:17 PM <class 'str'>
Sunday,July 07,2019 <class 'str'>
2019年07月07日星期0 14时57分17秒
July 07,2019 <class 'str'>
2. time
import time
# （1）当前时间戳
# time.time()
one = time.time()
print(one) # 1579454251.8242934
# （2）时间戳 → 元组时间
two = time.localtime(time.time())
print(two) # time.struct_time(tm_year=2020, tm_mon=1, tm_mday=20, tm_hour=1, tm_min=17, tm_sec=31, tm_wday=0, tm_yday=20, tm_isdst=0)
# （3）时间戳 → 可视化时间
three = time.ctime(time.time())
print(three) # Mon Jan 20 01:17:31 2020
# （4）元组时间 → 时间戳
four = time.mktime(two)
print(four) # 1579454251.0
# （5）元组时间 → 可视化时间
five = time.asctime()
print(five) # Mon Jan 20 01:17:31 2020
# （6）时间元组 → 可视化时间（定制）
six = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
print(six) # 2020-01-20 01:17:31
# （7）可视化时间（定制） → 时间元祖
print("时间元祖:", time.strptime('2019-7-7 11:32:23', '%Y-%m-%d %H:%M:%S'))
# 时间元祖: time.struct_time(tm_year=2019, tm_mon=7, tm_mday=7, tm_hour=11, tm_min=32, tm_sec=23, tm_wday=6, tm_yday=188, tm_isdst=-1)
# （8）将格式字符串转换为时间戳
eight = "Sun Jul 7 10:48:24 2019"
print(time.mktime(time.strptime(eight, "%a %b %d %H:%M:%S %Y")))
# 1562467704.0