sec_to_time(), sec_to_string(), string_to_sec(), time_diff()

By : voldomazta

<?

/**
* Time Functions
* by: Ramon Alivio Jr.
* on: 2005-06-17
**/

class Time {

/**
* Returns the time of the day using an integer argument which means the number of seconds from 12:00:00AM
* Examples : 32563 (09:02 AM), 53447 (2:50 PM)
**/

function sec_to_string($s,$f = '') {
$h = floor($s/3600);
$m = floor($s/60) - ($h * 60);
$ts = $s - ($h * 3600) - ($m * 60);
$hours = (strlen($h) == 1 ? '0'.$h : $h);
$minutes = (strlen($m) == 1 ? '0'.$m : $m);
$seconds = (strlen($ts) == 1 ? '0'.$ts : $ts);
$meridian = ' '.($h == 12 ? 'NN' : ($h > 12 ? 'PM' : 'AM'));
if($h > 24) return 'Invalid Time';
switch($f) {
case 12: return ($hours > 12 ? $hours-12 : $hours).':'.$minutes.$meridian;
case 24: return $hours.':'.$minutes; break;
default: return $hours.':'.$minutes.':'.$seconds; break;
}
}


/**
* A reverse of sec_to_string()
* Returns the number of seconds from 12:00:00AM using a string argument of the current time of the day.
* Example Arguments : 6:02:54PM (64974), 11:05AM (39900)
**/

function string_to_sec($time) {
preg_match("/([0-9]{0,2})\:([0-9]{0,2})\:?([0-9]{0,2})?\s?([a|A|p|P|n|N])([m|M|n|N])/",$time,$matches);
$hours = $matches[1];
$minutes = $matches[2];
$seconds = (empty($matches[3]) ? '00' : $matches[3]);
$meridian = strtoupper($matches[4].$matches[5]);
if($hours > 12 || $hours < 0) return false;
switch($meridian) {
case 'AM':
if($hours == 12) $hours = 0;
break;
case 'NN':
if($hours > 12 || $hours < 12) return false;
$add = 0;
break;
case 'PM':
if($hours == 12) return false;
$add = 43200;
break;
default:
$add = 0;
break;
}
return (int)(($hours * 3600) + ($minutes * 60) + $seconds + $add);
}


/**
* Returns the HH:mm:ss format of an integer. 1 being 00:00:01
* Examples: 5321 (01:28:41);
**/

function sec_to_time($sec) {
$diff = ($sec < 0 ? ($sec * -1) : $sec);
$h = floor($diff/3600);
$m = floor($diff/60) - ($h * 60);
$ts = $diff - ($h * 3600) - ($m * 60);
$hours = (strlen($h) == 1 ? '0'.$h : $h);
$minutes = (strlen($m) == 1 ? '0'.$m : $m);
$seconds = (strlen($ts) == 1 ? '0'.$ts : $ts);
return $hours.':'.$minutes.':'.$seconds;
}


/**
* Returns the number of hours, minutes and seconds between two times in a single day
* Examples: 12:00:00AM or 12:00AM
* Arguments are interchangeable
**/

function time_diff($time1,$time2) {
$newtime1 = $this->string_to_sec($time1);
$newtime2 = $this->string_to_sec($time2);
if(!$newtime1 || !$newtime2) return false;
return $this->sec_to_time($newtime1 - $newtime2);
}

}

?>

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