python时间减法

Question

我想在Python中获得时间.有time.ctime(),有很多功能:

我试过了:

def write_time():  
  NUMBER_OF_MIN=40 #my offset
  obj=time.gmtime()
  print  " D", obj.tm_mday, " M",obj.tm_mon,  "Y",obj.tm_year, 
  " time", obj.tm_hour+TIME_OFFSET,":",   obj.tm_min-NUMBER_OF_MIN, ":",obj.tm_sec

我想减去40分钟.

Answer 1

查看datetime库,它为使用日期的数学提供了更大的灵活性.

例如:

import datetime
print datetime.datetime.now()
print datetime.datetime.now() - datetime.timedelta(minutes=2)
print datetime.datetime.now() - datetime.timedelta(seconds=10)
print datetime.datetime.now() - datetime.timedelta(milliseconds=400)

打印:

el@dev ~ $ python test.py
2014-11-26 06:47:07.179411
2014-11-26 06:45:07.179538
2014-11-26 06:46:57.179581
2014-11-26 06:47:06.779614