Hour start and Hour end for an appointment

I am looking a way to create a form for an appointment, I have 2 fields so far, in format "string", is it correct according you?

<fieldset class="form-group ">
    <label for="company-content">Hour Start</label>
        <select name="hour_start" id="" class="form-control">
           <option value="">Hour Start</option>
           <option value="08:00" @if (old('hour_start') == "08:00") selected @endif>08:00</option>
           <option value="10:00" @if (old('hour_start') == "10:00") selected @endif>10:00</option>
        </select>
</fieldset>

 <fieldset class="form-group ">
    <label for="company-content">Hour End</label>
        <select name="hour_end" id="hour_end" class="form-control">
            <option value="">Hour End</option>
            <option value="10:00" @if (old('hour_end') == "10:00") selected @endif>10:00</option>
            <option value="13:00" @if (old('hour_end') == "13:00") selected @endif>13:00</option>
        </select>
</fieldset>

I think the validation will be complicated?

Thank you for your help.

via Chebli Mohamed