title: Generate pkpass files in Linux
body: <p>I'm trying to generate .pkpass files with this <a href="https://github.com/kyleroche/iOS6-passbook-helper" rel="nofollow">https://github.com/kyleroche/iOS6-passbook-helper</a></p>
  
  <p>The .pkpass is correctly generated and it also works on iOS 6, but is not working on iOS 7. I've read that it may have something to do with the "signature signing date" as now in iOS 7 is mandatory. Can someone help me to update my .sh so it can create valid .pkpasses for iOS 7 also?</p>
  
  <p>Thanks in advice</p>