python时间，时间戳相互转换函数

#encoding=utf-8

from datetime import date, datetime
import time
#已下时间都是当地时间，而不是UTC时间
#获取当前时间
d1 = datetime.today()
d2 = date.today()
print("d1=%s,    d2=%s" %(d1, d2))
#格式化输出
print("d1=%s"%(d1.strftime("%Y-%m-%d")))
print("d2=%s"%(d2.strftime("%Y-%m")))

#获取时间戳,时间戳格式都是一样的
t1 = datetime.timestamp(d1)
#t2 = date.timestamp(d2)，date没有转换时间戳函数
t3 = time.time()
print("t1=%f,    t3=%f"%(t1,t3))

#获得任意时间的时间戳
#TODO

#时间戳转换为时间
D1 = datetime.fromtimestamp(t1)
D2 = date.fromtimestamp(t1)
print("D1=%s,    D2=%s"%(D1, D2))


"""
strftime格式
%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.
%d Day of the month as a decimal number [01,31].
%H Hour (24-hour clock) as a decimal number [00,23].
%I Hour (12-hour clock) as a decimal number [01,12].
%j Day of the year as a decimal number [001,366].
%m Month as a decimal number [01,12].
%M Minute as a decimal number [00,59].
%p Locale’s equivalent of either AM or PM. (1)
%S Second as a decimal number [00,61]. (2)
%U Week number of the year (Sunday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Sunday are considered to be in week 0. (3)
%w Weekday as a decimal number [0(Sunday),6].
%W Week number of the year (Monday as the first day of the week) as a decimal number [00,53]. All days in a new year preceding the first Monday are considered to be in week 0. (3)
%x Locale’s appropriate date representation.
%X Locale’s appropriate time representation.
%y Year without century as a decimal number [00,99].
%Y Year with century as a decimal number.
%z Time zone offset indicating a positive or negative time difference from UTC/GMT of the form +HHMM or -HHMM, where H represents decimal hour digits and M represents decimal minute digits [-23:59, +23:59].
%Z Time zone name (no characters if no time zone exists).
%% A literal '%' character.
"""

输出

d1=2015-03-14 10:23:30.245054, d2=2015-03-14
d1=2015-03-14
d2=2015-03
t1=1426299810.245054, t3=1426299810.245055
D1=2015-03-14 10:23:30.245054, D2=2015-03-14