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例如：
$time1 = "12:45:03"; $time2 = "14:03:48"; $timelength = $time2- $time1;
//function to convert seconds into hour:minute:second
function sec2hms ($sec,$padHours = false)
{
// start with a blank string
$hms = "";
// do the hours First: there are 3600 seconds in an hour,so if we divide
// the total number of seconds by 3600 and throw away the remainder,we're
// left with the number of hours in those seconds
$hours = intval(intval($sec) / 3600);
// add hours to $hms (with a leading 0 if asked for)
$hms .= ($padHours)
? str_pad($hours,2,"0",STR_PAD_LEFT). ":"
: $hours. ":";
// dividing the total seconds by 60 will give us the number of minutes
// in total,but we're interested in *minutes past the hour* and to get
// this,we have to divide by 60 again and then use the remainder
$minutes = intval(($sec / 60) % 60);
// add minutes to $hms (with a leading 0 if needed)
$hms .= str_pad($minutes,STR_PAD_LEFT). ":";
// seconds past the minute are found by dividing the total number of seconds
// by 60 and using the remainder
$seconds = intval($sec % 60);
// add seconds to $hms (with a leading 0 if needed)
$hms .= str_pad($seconds,STR_PAD_LEFT);
// done!
return $hms;
}
$suBTracted_time = strtotime($time2) - strtotime($time1); //gives difference in seconds
echo(sec2hms($subtracted_time));
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