It seems zdump(8) just displays GMT for zones which do not exist. Is that intended?
Jan $ zdump Canada/* Canada/Toronto Canada/Atlantic Tue Mar 15 05:22:21 2016 ADT Canada/Central Tue Mar 15 03:22:21 2016 CDT Canada/East-Saskatchewan Tue Mar 15 02:22:21 2016 CST Canada/Eastern Tue Mar 15 04:22:21 2016 EDT Canada/Mountain Tue Mar 15 02:22:21 2016 MDT Canada/Newfoundland Tue Mar 15 05:52:21 2016 NDT Canada/Pacific Tue Mar 15 01:22:21 2016 PDT Canada/Saskatchewan Tue Mar 15 02:22:21 2016 CST Canada/Yukon Tue Mar 15 01:22:21 2016 PDT Canada/Toronto Tue Mar 15 08:22:21 2016 GMT