<select class="time-select table-input" id="id3">
<option value=""></option>
<option value="9:10 - 10:40">9:10 - 10:40</option>
<option value="10:50 - 12:20">10:50 - 12:20</option>
<option value="12:30 - 14:00">12:30 - 14:00</option>
<option value="14:20 - 15:50">14:20 - 15:50</option>
<option value="16:00 - 17:30">16:00 - 17:30</option>
</select>
var foo = id3.value
var foo = document.querySelector('#id3').value