I did but there is something wrong with the software.
You should not need to go and change every single time you move from one country to another...
I have to do it almost every other day since I'm a pilot...
I have the same problem on my S7 edge. I have moved and I can't change the home time zone. I have searched the settings for the widgets option, dual clock, time zone and nothing came out. I only have the automatic time zone option that doesn't have the home time zone feature when you turn it off.
I'm in the exact same boat as you. I'm a pilot as well and everytime I go to a new time zone, the dual clock's "home time zone" keep resetting to whatever the local time zone is. This is a new glitch for me as it used to work perfectly. It's incredibly annoying. Does anyone know of a solution?
When I came to Thailand my lock screen Dual clocks worked perfectly.
I had the same issue, Home and Roaming clocks showing the same time (roaming), after factory resetting my phone when I was in Thailand.
Here is the procedure to correct it - Android 6.0.1 on a SM-A500G
Settings > Lock screen > Show information > Dual clock > Switch On > Set Home City (to your desired Location.
(Note: This is NOT for the widget)