PHP: Odd behaviour with date_sunset function

Posted by Svish on Stack Overflow See other posts from Stack Overflow or by Svish
Published on 2010-05-14T20:51:06Z Indexed on 2010/05/14 20:54 UTC
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datetime

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odd-behaviour

I'm having a look at the date_sunset function in PHP and have met an issue that I find a bit strange. I have this piece of code:

$sunset = date_sunset(mktime(0, 0, 0, 5, 14, 2010),
    $format,                // Format
    55.596041,              // Latitude
    12.992495,              // Longitude
    90,                     // Zenith
    2                       // GMT Offset
);

For the three different formats, that would give me:

SUNFUNCS_RET_STRING    21:05
SUNFUNCS_RET_DOUBLE    21.095732016315
SUNFUNCS_RET_TIMESTAMP 1273863944 // H:i:s O -> 19:05:44 +0000

Why is the timestamp format ignoring the gmt offset? Is is supposed to be like that? If so what is the reason behind that?

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