Re: [libreoffice-users] Re: Can't Sum() time measurements

2012/8/8 teknow <teknowledgist@gmail.com>:
> Thanks for the responses.
>
> I'm being given an already filled-out .xlsx, but I'm not seeing a difference
> if I save it to .ods.
>
> The cells are identified as in H:MM format, but the actual measurements are
> in minutes and seconds (with a few H:MM:SS sprinkled in).  It's a bit
> confusing because what I see in the Cell is "1:18" as in one minute and
> eighteen seconds, but what I see in the input line is "01:18:00 AM".  The
> hours and minutes makes sense, but what is that "AM" doing there?  If I
> switch to text format, I get decimal numbers (e.g. 0.0541666666666667 in the
> "1:18" cell).

0.0541666666666667=1:18:00 (1 hour, 18 minutes)
1.0=24:00:00
0.5=12:00:00
0.25=06:00:00
and so on.

To be exact, 0.5 really means 1899-12-30 12:00:00 (0.5 days since
1899-12-30 00:00:00), the same for 1.0 which then means 1899-12-31
00:00:00.
Formatting to a pure time format, such as HH:MM:SS ”hides” the date,
so we don't need to bother about irrelevant years, months and days,
for example when you sum times.

The format you see in your input line is probably dependent on your
language settings, therefore the AM in your case and not in my case.



Kind regards

Johnny Rosenberg
ジョニー・ローゼンバーグ
> Completely not understanding, I was doing some text manipulation (copy to
> notepad, add "00:" to the front end, copy back) to try to get the values
> recognized as minutes and seconds, and that appears to have caused the
> screw-up.  I suppose pursuing why those cells add like time (seconds roll
> over to minutes at 60, etc.) when they only look like time values, but don't
> sum() at all should be left for another day.
>
> If I ignore the entries with hours (which I suspect are erroneous anyway)
> and simply divide the original cells by 60, and set the formatting to
> [H]:MM:SS, I appear to be getting what I need and sum() works as I would
> expect.
>
> Sorry for the confusion.
>
>
>
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