Unless you live in the Azores, I'm guessing you use WET/WEST, which are the same as the English GMT/BST. On the Timezone Settings
page, we try to provide at least one link to click for each currently
unique timezone, where unique means different in regular offset, savings time offset (if any), savings time beginning/ending rules, or abbreviations. The link there for WET/WEST is labeled Atlantic/Canary, which I think is what you want. If you are particular about your timezone name matching your actual country, click on one of the links, and then edit the url it uses to specify what timezone you want (for example, Europe/Lisbon or Atlantic/Madeira); the perlmonks servers use a fairly recent Olson timezone database.
I thought tye had set up a page to allow you to test whether/how a timezone name was supported, but don't recall where that was (and may just be misremembering).