title: Swift: Get 30 days before 'Specific Date'
body: <p>I have a problem about showing specific date. Here the case, I have a random date from my API (06/16/2015) that always change. I put it into variable name <code>toDate</code> with Date type. I need to get 30 days before the <code>toDate</code> for my <code>fromDate</code> variable.</p>
  <p>I read <a href="https://stackoverflow.com/questions/38781435/how-to-set-date-picker-minimum-date-with-one-month-back-from-today">this</a> but it's still not working. Note: I don't have any DatePicker in this controller.</p>