use UTC timezone

Author: sylv256

_config.yml

@@ -25,7 +25,7 @@ description: >- # this means to ignore newlines until "baseurl:"
 baseurl: "" # the subpath of your site, e.g. /blog
 url: "https://muonmc.org" # the base hostname & protocol for your site, e.g. http://example.com
 markdown: kramdown
-timezone: America/New_York
+timezone: Etc/UTC
 
 theme_config:
   date_format: "%-d %B %Y %H:%M:%S %Z"