python datetime 

 1 import datetime as DT
 2 
 3 #convert character string: '20150212 10:12:11' to datetime type: pTime
 4 pTime = DT.datetime.strptime('20150212 10:12:11', '%Y%m%d %H:%M:%S')
 5 
 6 #calculate the number of days between two date：utcnow() and pTime
 7 days = (  DT.datetime.utcnow()-  pTime  ).days
 8 
 9 #day of the year
10 DOY = (  pTime- DT.datetime(pTime.year, 1, 1) ).days+1
11 
12 #calculate the time after 1h
13 aftTime = pTime+ DT.timedelta(hours=1)

 

posted @ 2016-02-29 08:22  liangxw  阅读(127)  评论(0)    收藏  举报