Python的datetime常用几个操作

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''''' 日期相关的操作 '''
from datetime import datetime
from datetime import timedelta
DATE_FMT = '%Y-%m-%d'
DATETIME_FMT = '%Y-%m-%d %H:%M:%S'
DATE_US_FMT = '%d/%m/%Y'
''''' 
格式化常用的几个参数 
Y : 1999 
y :99 
m : mouth 02 12
M : minute 00-59 
S : second 
d : day 
H : hour 
'''
def dateToStr(date):
'''''把datetime类型的时间格式化自己想要的格式'''
return datetime.strftime(date, DATETIME_FMT)
def strToDate(strdate):
'''''把str变成日期用来做一些操作'''
return datetime.strptime(strdate, DATETIME_FMT)
def timeElement():
'''''获取一个时间对象的各个元素'''
now = datetime.today()
print 'year: %s  month: %s  day: %s' %(now.year, now.month, now.day)
print 'hour: %s  minute: %s  second: %s' %(now.hour, now.minute, now.second)
print 'weekday: %s ' %(now.weekday()+1)  #一周是从0开始的
def timeAdd():
'''''
时间的加减,前一天后一天等操作
datetime.timedelta([days[, seconds[, microseconds[, milliseconds[, minutes[, hours[, weeks]]]]]]])
参数可以是正数也可以是负数
得到的对象可以加也可以减 乘以数字和求绝对值
'''
atime = timedelta(days=-1)
now = datetime.strptime('2001-01-30 11:01:02', DATETIME_FMT)
print now + atime
print now - abs(atime)
print now - abs(atime)*31
import calendar
def lastFirday():
today = datetime.today()
targetDay = calendar.FRIDAY
thisDay = today.weekday()
de = (thisDay - targetDay) % 7
res = today - timedelta(days=de)
print res
def test():
#print dateToStr(datetime.today())
#print strToDate('2013-01-31 12:00:01')
#timeElement()
#timeAdd()
#lastFirday()
if __name__=='__main__':
test()  

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