I'm looking at KDE Plasma version 5.24.7 and its analog clock widget. I'm not seeing any readily available configuration option to change the time zone for any instances of it. I'd really like to have analog clocks with different time zones than the system time. How can that be done?

I presume there is some file which must be edited in order to be able to use a custom time zone with the default (or any other) analog clock widget there? I've looked at ~/.config/plasma-org.kde.plasma.desktop-appletsrc but not made any sense of it.

Or is there a better analog clock widget than the default one?

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If by "different time zones than the system time" you mean that

1. Your system time is UTC, and
2. You want the clocks to display your local time,

see man tzselect.

Thanks, I'm asking a different question as I already have the system time zone set correctly.

Say the system clock is set to Canada/Mountain, I would like the KDE analog clock widget to display time other than the already correctly set system time, such as UTC, Asia/Singapore, America/Detroit, Australia/Hobart, or so on. I can do the calculation easily enough in my head, with a high level of accuracy, but it saves effort to have the other time zone(s) displayed visually instead.

XFCE4 widgets allow choosing custom, per-clock widget time zones. With KDE, it seems very crippled but perhaps that is just lack of knowledge about what to edit and where.