Ah, sorry I made a typo. Meant to say DST+0.5 for Alberta, judging off the main population centres. Most of the province lives in the Edmonton-Calgary corridor (roughly UTC-7.57 to UTC-7.6) and would be closer to 1h 30-40 minutes as you pointed out, whereas it's truly about a 1h 48 minute offset for Golden, and almost exactly 2 hours for Whitehorse.
Ignoring my typo, I think the point is that southeastern BC copying Alberta Time would be even more radical for them since they are even further west. Cities longitudinally east of Golden like Las Vegas are using PST/PDT, and Golden and Cranbrook would essentially be on CST. What’s only 30 to 40 minutes on top of DST for Alberta, turns into basically another hour for a lot of BC. But hey, what’s another 20 minutes of sunlight in the evening compared to Alberta gonna do?
