python时间偏移
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python time offset
提问by Guillaume07
How can I apply an offset on the current time in python?
如何在python中的当前时间应用偏移量？
In other terms, be able to get the current time minus x hours and/or minus m minutes and/or minus s secondes and/or minus ms milliseconds
换句话说，能够得到当前时间减去 x 小时和/或减去 m 分钟和/或减去 s 秒和/或减去 ms 毫秒
for instance
例如
curent time = 18:26:00.000
offset = 01:10:00.000
=>resulting time = 17:16:00.000
采纳答案by Martijn Pieters
Use a datetime.datetime(), then add or subtract datetime.timedelta()instances.
使用 a datetime.datetime()，然后添加或减去datetime.timedelta()实例。
>>> import datetime
>>> t = datetime.datetime.now()
>>> t - datetime.timedelta(hours=1, minutes=10)
datetime.datetime(2012, 12, 26, 17, 18, 52, 167840)
timedelta()arithmetic is not supported for datetime.time()objects; if you need to use offsets from an existing datetime.time()object, just use datetime.datetime.combine()to form a datetime.datetime()instance, do your calculations, and 'extract' the time again with the .time()method:
timedelta()datetime.time()对象不支持算术；如果您需要使用现有datetime.time()对象的偏移量，只需用于datetime.datetime.combine()形成一个datetime.datetime()实例，进行计算，然后使用该.time()方法再次“提取”时间：
>>> t = datetime.time(1, 2)
>>> dt = datetime.datetime.combine(datetime.date.today(), t)
>>> dt
datetime.datetime(2012, 12, 26, 1, 2)
>>> dt -= datetime.timedelta(hours=5)
>>> dt.time()
datetime.time(20, 2)
