Undefined Offset Question

hi all, i have a problem. when i run this page, all the output can be displayed correctly. but there will be a long list of undefined offset errors. i've read about undefined offsets, but i don't seem to be able to find out similar cases to mine.

the errors shown are:

Notice: Undefined offset: 1 in C:\Inetpub\wwwroot2\Redemption\Redemption_Overview.php on line 129

Notice: Undefined offset: 1 in C:\Inetpub\wwwroot2\Redemption\Redemption_Overview.php on line 131

Notice: Undefined offset: 2 in C:\Inetpub\wwwroot2\Redemption\Redemption_Overview.php on line 131

Notice: Undefined offset: 1 in C:\Inetpub\wwwroot2\Redemption\Redemption_Overview.php on line 154
 
Notice: Undefined offset: 1 in C:\Inetpub\wwwroot2\Redemption\Redemption_Overview.php on line 158

Notice: Undefined offset: 1 in C:\Inetpub\wwwroot2\Redemption\Redemption_Overview.php on line 129

Notice: Undefined offset: 1 in C:\Inetpub\wwwroot2\Redemption\Redemption_Overview.php on line 131

Notice: Undefined offset: 2 in C:\Inetpub\wwwroot2\Redemption\Redemption_Overview.php on line 131
 
Notice: Undefined offset: 1 in C:\Inetpub\wwwroot2\Redemption\Redemption_Overview.php on line 154
 
Notice: Undefined offset: 1 in C:\Inetpub\wwwroot2\Redemption\Redemption_Overview.php on line 158

the codes that from these few lines of errors are:

            for ($i = 0; $i < sizeof($arrRedemption); $i++)
            {
      //* split the date and the time
      $entry_Date = $arrRedemption[$i]->get_redemption_entry_time();
      $entryDate = explode(" ",$entry_Date);
            
      $exit_Date = $arrRedemption[$i]->get_redemption_exit_time();
      $exitDate = explode(" ",$exit_Date);

      //* change to become readable format
      $time_1=$exitDate[1]; //error lies here
      $time_11=explode(':',$time_1);
      $exit = (($time_11[0]*60*60)+($time_11[1]*60)+$time_11[2]); //error lies here

      $time_2=$entryDate[1];
      $time_22=explode(':',$time_2);
      $entry = ($time_22[0]*60*60)+($time_22[1]*60)+$time_22[2];

      $diff = $exit-$entry;
            
      $hour_1=$diff%3600;
      $hour_2=$diff-$hour_1;
      $hour=$hour_2/3600;

      $min_1=$diff-($hour*3600);
      $sec=$min_1%60;
      $min_2=$min_1-$sec;
      $min=$min_2/60;
      
      $duration = $hour. ":" .$min. ":" .$sec;

                echo "<tr>";
      echo "<td class=\"CenterContent\">".$i."</td>";
      echo "<td class=\"CenterContent\">".$entryDate[1]."</td>";
      echo "<td class=\"CenterContent\">".$exitDate[1]."</td>"; //error lies here
      if ($exitDate[1]==NULL){
            echo "<td class=\"CenterContent\">".NULL."</td>";
      }else{
                      echo "<td class=\"CenterContent\">".$duration."</td>";
      }
                echo "<td class=\"CenterContent\">".wordwrap($arrRedemption[$i]->get_redemption_cashcard_id(), 17, "<br>", 1)."</td>";
                echo "<td class=\"CenterContent\">".$arrRedemption[$i]->get_redemption_type()."</td>";
                echo "<td class=\"CenterContent\">".number_format($arrRedemption[$i]->get_redemption_parking_fee(), 2)."</td>";
                echo "<td class=\"CenterContent\">".number_format($arrRedemption[$i]->get_redemption_amount(), 2)."</td>";
                echo "<td class=\"CenterContent\">".number_format($arrRedemption[$i]->get_redemption_amount_payable(), 2)."</td>";
                echo "</tr>";
            }


please help... thanks!
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