BC Government Information: https://www2.gov.bc.ca/gov/content/governments/celebrating-british-columbia/daylight-saving-time

British Columbia observed Daylight Savings Time every year until it was ended in 2026. Quoting the article above:

"The transition to one year-round time zone began on March 8, 2026, when clocks moved ahead by one hour. This was the final time change in British Columbia. People and businesses need to prepare for November 1, 2026, when clocks would usually be turned back, but now will remain the same. At that point, the transition to Pacific time, the name of B.C.’s new time zone, will be complete. PCT is the accompanying abbreviation. PCT replaces the former seasonal abbreviations PST (Pacific standard time) and PDT (Pacific daylight time).
...
Pacific time/PCT operates at seven hours behind co-ordinated universal time (UTC-7), matching the current offset used during daylight saving time."

This update was applied to the IANA Timezone Database in release 2026b: https://www.iana.org/time-zones/releases/2026b

Proton, especially Proton Calendar, shows the timezones as "GMT-8 America/Vancouver", but this offset is no longer accurate.

This suggestion is to update Proton to match the new Canadian timezones

As I was researching this post, I noted that Manitoba had also moved to permanent UTC-5
https://www.gov.mb.ca/timechange/index.html
https://www.iana.org/time-zones/releases/2026e

Also Northwest Territories:
https://www.cbc.ca/news/canada/north/nwt-ends-daylight-saving-9.7170964
https://www.iana.org/time-zones/releases/2026d