title: How to convert a Persian date into a Gregorian in swift
body: <p>I want to convert data between "Persian date and Gregorian" in swift. I was looking into algorithm to help me convert between them, but I did not really understand how to implement them.</p>
  
  <p>If their is an existing way to do the job in Swift please point me to it.</p>
  
  <p>Providing and example will be also appreciated.</p>