Computer security and changing time zone in Settings

bodin:

Is it a security (or privacy) concern to change the system time on my desktop and on iOS to something other than my local time?

Yes, it may prevent you from accessing the Internet due to digital certificates being issued in the future, etc:

Whonix – 24 Feb 26

Network Time Synchronization

A reasonably accurate host clock is required for many general security properties. An inaccurate clock can lead to broken internet connectivity and time related security issues.