[Solved] Why RFP changes time-zone to Atlantic/Reykjavik

New version of user.js:

user.js/user.js at 6446d73cf572fcdf631534a5a51276a64eec4a2d · arkenfox/user.js · GitHub

mentions under RFP title:

spoof timezone as Atlantic/Reykjavik (previously FF55+ was UTC)

What that means exactly? I search for it but I could not find anything useful…

UPDATE: My question is not about to learn UTC and time-zone terms. I know the terms. But why it changed today? Why we don’t use any other country which use UTC+0 ? What happened and make a decision?

I updated my original post. My question was not about to learn what they are… but why they make a decision today…

Thorin-Oakenpants provided a timely update in this GitHub comment which contains a link to your post:

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