在python中将日期字符串转换为日期时间对象时,微秒部分丢失

时间:2011-08-02 20:49:41

标签: python datetime time

我有以下日期字符串:

dtstr = '2010-12-19 03:44:34.778000'

我想将它转换为日期时间对象,所以我继续如下:

import time
from datetime import datetime

dtstr = '2010-12-19 03:44:34.778000'
format = "%Y-%m-%d %H:%M:%S.%f"
datetime.fromtimestamp(time.mktime(time.strptime(dtstr,format)))

但是返回了:datetime.datetime(2010, 12, 19, 3, 44, 34)而不是datetime.datetime(2010, 12, 19, 3, 44, 34,778000)

为什么微秒部分被省略?我如何获得datetime.datetime(2010, 12, 19, 3, 44, 34,778000)

请帮助 谢谢

2 个答案:

答案 0 :(得分:7)

from datetime import datetime

dtstr = '2010-12-19 03:44:34.778000'
format = "%Y-%m-%d %H:%M:%S.%f"
a = datetime.strptime(dtstr,format)
print a.microsecond

time处理自Unix纪元以来的秒数,因此使用time会丢失微秒。直接使用datetime.strptime

答案 1 :(得分:2)

time.struct_time返回的time.strptime对象不存储毫秒:

In [116]: time.strptime(dtstr,"%Y-%m-%d %H:%M:%S.%f",)
Out[116]: time.struct_time(tm_year=2010, tm_mon=12, tm_mday=19, tm_hour=3, tm_min=44, tm_sec=34, tm_wday=6, tm_yday=353, tm_isdst=-1)

但是dt.datetime.strptime返回的datetime对象确实存储了毫秒:

In [117]: import datetime as dt

In [118]: dt.datetime.strptime(dtstr,"%Y-%m-%d %H:%M:%S.%f")
Out[118]: datetime.datetime(2010, 12, 19, 3, 44, 34, 778000)