The following timezone names are currently understood (and can be used
in parsing dates).  These are zones defined in RFC 822.

  Universal:  GMT, UT
  US zones :  EST, EDT, CST, CDT, MST, MDT, PST, PDT
  Military :  A to Z (except J)
  Other    :  +HHMM or -HHMM
  ISO 8601 :  +HH:MM, +HH, -HH:MM, -HH