模块-time

#当前时间戳
time.time()

#将时间戳转换为本地时间对象，不传值返回当前系统时间的本地时间对象
lt=time.localtime(time.time())

#类似localtime，将时间戳转换为UTC时区(比北京时间早8小时)的时间对象，不提工参数以本地时间为准
gt=time.gmtime()

#将时间对象转换为时间戳
lt=time.localtime(time.time())
time.mktime(lt)

#将时间元组或者时间戳对象转换成国外显示方式
#无参数转换本地时间
time.asctime(11111111111111)

#将时对象转换成指定格式字符串,不指定时间对象，则转本地时间
time.strftime("%Y-%m-%d %H:%M:%S",time.localtime(time.time()))
# %Y  Year with century as a decimal number.
# %m  Month as a decimal number [01,12].
# %d  Day of the month as a decimal number [01,31].
# %H  Hour (24-hour clock) as a decimal number [00,23].
# %M  Minute as a decimal number [00,59].
# %S  Second as a decimal number [00,61].
# %z  Time zone offset from UTC.
# %a  Locale's abbreviated weekday name.
# %A  Locale's full weekday name.
# %b  Locale's abbreviated month name.
# %B  Locale's full month name.
# %c  Locale's appropriate date and time representation.
# %I  Hour (12-hour clock) as a decimal number [01,12].
# %p  Locale's equivalent of either AM or PM.

快速计算当前是今年第多少周

time.strftime('%U',time.localtime(time.time()))

将字符串转换成时间对象

s=time.strftime("%Y-%m-%d %H:%M:%S")
>>> s
'2018-04-09 20:40:45'
>>> s2=time.strptime(s,"%Y-%m-%d %H:%M:%S")
>>> s2
time.struct_time(tm_year=2018, tm_mon=4, tm_mday=9, tm_hour=20, tm_min=40, tm_sec=45, tm_wday=0, tm_yday=99, tm_isdst=-1)
>>> time.mktime(s2)
1523277645.0