title: How can I validate whether the time has been taken
body: <p>I have a table like this:</p>
  
  <pre>
  ID   StartTime   EndTime    DaysClasses
  1      9:30       11:29       M,T,W,TH
  2     11:30        1:30       M,T,W,F
  
  </pre>
  
  <p>What I want to achieve is, validate whether a row exists by checking the time, and the days. I was able to validate the time, but I'm having trouble how to include the days.</p>