<form  id='updateTimezone' action="{{ route('user.updateTimezone') }}" method="post">
                                @csrf
                                <input type="hidden" name="user_id" id="user_id" value="{{auth()->user()->_id}}"/>
                                <select name="timezone" id="timezone" onchange="$('#updateTimezone').submit()">
                                    @foreach(DateTimeZone::listIdentifiers(DateTimeZone::ALL) as $timezone)
                                        <option @if((auth()->user()->timezone == $timezone)) selected @endif value="{{$timezone}}">
                                            {{$timezone}}
                                        </option>
                                    @endforeach
                                </select>
                            </form>