Python - 将纳秒的纪元时间转换为人类可读的？
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Python - Convert epoch time with nanoseconds to human-readable?
提问by victorhooi
I have a timestamp in epoch time with nanoseconds - e.g. 1360287003083988472nanoseconds since 1970-01-01.
我有一个以纳秒为单位的纪元时间戳 - 例如1360287003083988472自 1970-01-01 以来的纳秒。
The Python datetime objects and conversion methods only support up to millisecond precision.
Python 日期时间对象和转换方法仅支持最高毫秒精度。
Is there an easy way to convert this epoch time into human-readable time?
有没有一种简单的方法可以将这个纪元时间转换为人类可读的时间？
Cheers, Victor
干杯，维克多
采纳答案by Andrew Clark
First, convert it to a datetimeobject with second precision (floored, not rounded):
首先，将其转换为datetime具有第二精度的对象（落地，不四舍五入）：
>>> from datetime import datetime
>>> dt = datetime.fromtimestamp(1360287003083988472 // 1000000000)
>>> dt
datetime.datetime(2013, 2, 7, 17, 30, 3)
Then to make it human-readable, use the strftime()method on the object you get back:
然后为了使其可读，请strftime()在您返回的对象上使用该方法：
>>> s = dt.strftime('%Y-%m-%d %H:%M:%S')
>>> s
'2013-02-07 17:30:03'
Finally, add back in the nanosecond precision:
最后，加回纳秒精度：
>>> s += '.' + str(int(1360287003083988472 % 1000000000)).zfill(9)
>>> s
'2013-02-07 17:30:03.083988472'
回答by abarnert
Actually, Python's datetimemethods handle microsecondprecision, not millisecond:
实际上，Python 的datetime方法处理微秒精度，而不是毫秒：
>>> nanos = 1360287003083988472
>>> secs = nanos / 1e9
>>> dt = datetime.datetime.fromtimestamp(secs)
>>> dt.strftime('%Y-%m-%dT%H:%M:%S.%f')
'2013-02-07T17:30:03.083988'
But if you actually neednanoseconds, that still doesn't help. Your best bet is to write your own wrapper:
但是，如果您确实需要纳秒，那仍然无济于事。最好的办法是编写自己的包装器：
def format_my_nanos(nanos):
dt = datetime.datetime.fromtimestamp(nanos / 1e9)
return '{}{:03.0f}'.format(dt.strftime('%Y-%m-%dT%H:%M:%S.%f'), nanos % 1e3)
This gives me:
这给了我：
'2013-02-07T17:30:03.083988472'
Of course you could have done the same thing even if Python didn't do sub-second precision at all…
当然，即使 Python 根本没有达到亚秒级精度，您也可以做同样的事情……
def format_my_nanos(nanos):
dt = datetime.datetime.fromtimestamp(nanos / 1e9)
return '{}.{:09.0f}'.format(dt.strftime('%Y-%m-%dT%H:%M:%S'), nanos % 1e9)
