<?php $_POST = [ "start_shift1" => "09:00", "end_shift1" => "17:00", "break1" => "02:30" ]; if(isset($_POST['start_shift1']) && $_POST['end_shift1'] && $_POST['break1'] != "") { $datetime1 = new DateTime($_POST['start_shift1']); $datetime2 = new DateTime($_POST['end_shift1']); list($h, $m) = explode(":", $_POST['break1']); $break = new DateInterval("PT{$h}H{$m}M"); $mondiff = $datetime1->add($break)->diff($datetime2); ?> <input type="text" readonly class="form-control" name="monday" value="<?php echo $mondiff->format('%H:%I'); ?>"> <?php } ?>
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