change text option selected

change text option selected

I have such html code snippet:

<select name="submitted[doum_tarihi][day]" class="form-select day" id="edit-submitted-doum-tarihi-day" >
<option value="" selected="selected">Day</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>

how can I change the text "Day" to "Month" with jquery?