Original date string: 2017-06-19 10:07:42-0700

Using Time::Local
  Epoch seconds: 1500484062
  CORE::localtime: Wed Jul 19 10:07:42 2017

Using Time::Piece:
  strptime as static method:
     stringified: Mon Jun 19 17:07:42 2017
     datetime: 2017-06-19T17:07:42
     tzoffset: 0
     hour: 17
  strptime as localtime instance method:
     stringified: Mon Jun 19 17:07:42 2017
     datetime: 2017-06-19T17:07:42
     tzoffset: -25200
     hour: 17
  strptime as gmtime instance method:
     stringified: Mon Jun 19 17:07:42 2017
     datetime: 2017-06-19T17:07:42
     tzoffset: 0
     hour: 17