Description:
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Functions date_sunset() and date_sunrise() return incorrect timestamps.

Reproduce code:
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$sunrise = date_sunrise(time(),SUNFUNCS_RET_TIMESTAMP);
$sunset = date_sunset(time(),SUNFUNCS_RET_TIMESTAMP);

$day_length = $sunset - $sunrise; 

echo($day_length); //This line shows number of minutes, not seconds.

echo date("Y m d G:i:s", $sunrise); //This line shows incorrect time.