Doba odchodu

//priklad: $sraz: 12:55:00
$sraz = $srz1 . ":" . $srz2 . ":" . $srz3;
echo $sraz;
$sraz=explode(':',$sraz);

$sraz=$sraz[0]*3600+$sraz[1]*60+$sraz[2];
$cesta=$cestavsec;
//$cestavsec uz mam nastavenou z prubehu predchazejiciho scriptu...
$odchod=$sraz-$cesta;

echo 'Odchod: ';
echo floor($odchod/3600).':';
echo floor($odchod%3600/60).':';
echo $odchod%60;

<form action="" method="post">
<table>
<tr><td>Tve souradnice X<input name="mojex" maxlength="4" s[****************************************e="4" class="fm">Y<input name="mojey" maxlength="4" s[****************************************e="4" class="fm"</td></tr>
<tr><td>Souradnice oběti X<input name="jehox" maxlength="4" s[****************************************e="4" class="fm">Y<input name="jehoy" maxlength="4" s[****************************************e="4" class="fm"></td></tr>
<tr><td>Den a čas, kdy má útok dojít</td></tr>
<tr><td>Den<input name="den" maxlength="4" s[****************************************e="4" class="fm">
<select name="mesic" s[****************************************e="1" class="fm">
<option value="January">Leden
<option value="February">Únor
<option value="March">Březen
<option value="April">Duben
<option value="May">Květen
<option value="June">Červen
<option value="July">Červenec
<option value="August">Srpen
<option value="September">Září
<option value="October">Říjen
<option value="November">Listopad
<option value="December">Prosinec
</select>
Rok<input name="rok" maxlength="4" s[****************************************e="4" class="fm"></td></tr>
<tr><td>Čas<input name="hod" maxlength="2" s[****************************************e="2" class="fm">:<input name="min" maxlength="2" s[****************************************e="2" class="fm">:<input name="sec" maxlength="2" s[****************************************e="2" class="fm"></td></tr>
<tr><td colspan="2"><input type="submit" value="Vypočítej!" class="fm fm110"></td></tr>
</table>
</form>

$polezahodinu = "257";// 257 = rychlost 1 pole palkare na speed/ hodinu
$jehox = $_POST['jehox'];
$jehoy = $_POST['jehoy'];
$mojex = $_POST['mojex'];
$mojey = $_POST['mojey'];
$rozdilx = abs($jehox-$mojex);
$rozdily = abs($jehoy-$mojey);
$[****************************************dalenost = sqrt($rozdily * $rozdily + $rozdilx * $rozdilx);
$cascesty = $[****************************************dalenost * $polezahodinu;// 257 = rychlost 1 pole palkare na speed/ hodinu
$den = $_POST['den'];
$mesic = $_POST['mesic'];
$rok = $_POST['rok'];
$hod = $_POST['hod'];
$min = $_POST['min'];
$sec = $_POST['sec'];
$datum = "$den $mesic $rok $hod:$min:$sec";
$now = strtotime("now");
$secakce = strtotime($datum);
$secdoakce = abs($now-($secakce+$cascesty));
if($secdoakce > 3600){
$konecnahodina = floor($secdoakce/3600);
}else{
$konecnahodina = "00";
}
$secdoakce2 = $secdoakce - ($konecnahodina * 3600);
if($secdoakce2 > 60){
$konecnaminuta = floor($secdoakce2/60);
}else{
$konecnaminuta = "00";
}
$konecnasec = floor($secdoakce2 - ($konecnaminuta * 60));
$konecnedatum = "$konecnahodina:$konecnaminuta:$konecnasec";
echo $konecnedatum;