UTC time is used because we cannot format time as "Fri, 22 May 2020
06:33:00 +0000" with the times package.
"zz" returns +00 & "zzz" returns +00:00, note that the former doesn't
return minutes value so it'll return +05 for systems in timezone
+0530 & "zzz" will return +05:30 for the same.
Instead of parsing it again & removing ':' manually we use UTC time &
add "+0000".
418bb3fe47