Poorly offsets your .srt files.

Subtitle Offsetter.php

<?php
date_default_timezone_set("Etc/Utc");

$offset = -24;

$output = fopen("output.srt", "w");

foreach(file("input.srt") as $line)
{
	$line = trim($line);
	if(strpos($line, " --> ") !== false)
	{
		$arr = explode(" --> ", $line);
		$fromarr = explode(",", $arr[0]);
		$toarr = explode(",", $arr[1]);
		$line = date("H:i:s", strtotime("1/1/1970 ".$fromarr[0]) + $offset).",".$fromarr[1]." --> ".date("H:i:s", strtotime("1/1/1970 ".$toarr[0]) + $offset).",".$toarr[1];
	}
	fwrite($output, $line."\r\n");
}

fclose($output);

?>