[Q] Clock time zone malfunction

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USA based "home" service. In Heathrow airport the phone showed UK time when booted up after flight. Then, without changing any settings, when I shut it down and rebooted in Amsterdam a couple of hours later it reverted back to USA time.

Stock ICS, no root. Under settings/date & time/ the tick boxes are checked for both Automatic date & time and Automatic time zone. Under the Calendar app/Settings/General Preferences/ the tick box for Use home time zone is not checked.

I have all my calendar entries tied to a time zone, some are Europe, some are USA. I travel enough to understand the need. But, calendar becomes useless if the system time doesn't recognize the time zone.

Is there another setting in there somewhere I'm missing?

I believe that it's a problem with the date/time supplied by your phone carrier.

Automatic date & time
This comes from your carrier.
MAYBE you carrier is trying to change the timezone for you...

Automatic time zone
This comes from your GPS/Phone location services.

I would disable "Automatic date & time", and keep only the "Automatic time zone".
This way, all you have to do is open some GPS based app (maps, weather, news...) to get your timezone updated automatically.

Good luck!