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Date: Wed, 2 Jan 2013 09:33:39 +0100
Subject: Re: Using mktime to convert date to seconds since epoch - omitting elements from the tuple?
From: Vlastimil Brom <vlastimil.brom@gmail.com>
To: python-list@python.org
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2013/1/2 Victor Hooi <victorhooi@gmail.com>:
> Hi,
>
> I'm using pysvn to checkout a specific revision based on date - pysvn will only accept a date in terms of seconds since the epoch.
>
> I'm attempting to use time.mktime() to convert a date (e.g. "2012-02-01) to seconds since epoch.
>
> According to the docs, mktime expects a 9-element tuple.
>
> My question is, how should I omit elements from this tuple? And what is the expected behaviour when I do that?
>
> For example, (zero-index), element 6 is the day of the week, and element 7 is the day in the year, out of 366 - if I specify the earlier elements, then I shouldn't really need to specify these.
>
> However, the docs don't seem to talk much about this.
>
> I just tried testing putting garbage numbers for element 6 and 7, whilst specifying the earlier elements:
>
>> time.mktime((2012, 5, 5, 23, 59, 59, 23424234, 5234234 ,0 ))
>
> It seems to have no effect what numbers I set 6 and 7 to - is that because the earlier elements are set?
>
> How should I properly omit them? Is this all documented somewhere? What is the minimum I need to specify? And what happens to the fields I don't specify?
>
> Cheers,
> Victor
> --
> http://mail.python.org/mailman/listinfo/python-list

Hi,
if you initially have the time information as string, you might use
time.strptime(...) to extract this based on the supplied format; the
output of this function is usable as input for mktime, the remaining
fields are presumably handled consistently.
see:
http://docs.python.org/2/library/time.html#time.strftime

>>> time.strptime("2012-3-17", "%Y-%m-%d")
time.struct_time(tm_year=2012, tm_mon=3, tm_mday=17, tm_hour=0,
tm_min=0, tm_sec=0, tm_wday=5, tm_yday=77, tm_isdst=-1)
>>> time.mktime(time.strptime("2012-3-17", "%Y-%m-%d"))
1331938800.0
>>>

hth,
   vbr