html - Double Entry on Select? -

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i have 2 select tags form someone's birthday, dob month , dob day. problem (yes sometimes) duplicated dob in database. these selects should give me "july 23" dob in instances "july 23 july 23". idea how happening?

<select name="dobmonth" class="form-control">     <option value="">june 23</option>     <option value="january">january</option>     <option value="february">february</option>     <option value="march">march</option>     <option value="april">april</option>     <option value="may">may</option>     <option value="june">june</option>     <option value="july">july</option>     <option value="august">august</option>     <option value="september">september</option>     <option value="october">october</option>     <option value="november">november</option>     <option value="december">december</option> </select>  <select name="dobday" class="form-control">     <option value="">june 23</option>     <option value="1">1</option>     <option value="2">2</option>     <option value="3">3</option>     <option value="4">4</option>     <option value="5">5</option>     <option value="6">6</option>     <option value="7">7</option>     <option value="8">8</option>     <option value="9">9</option>     <option value="10">10</option>     <option value="11">11</option>     <option value="12">12</option>     <option value="13">13</option>     <option value="14">14</option>     <option value="15">15</option>     <option value="16">16</option>     <option value="17">17</option>     <option value="18">18</option>     <option value="19">19</option>     <option value="20">20</option>     <option value="21">21</option>     <option value="22">22</option>     <option value="23">23</option>     <option value="24">24</option>     <option value="25">25</option>     <option value="26">26</option>     <option value="27">27</option>     <option value="28">28</option>     <option value="29">29</option>     <option value="30">30</option>     <option value="31">31</option> </select>


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