Thanks for the reply. Phone has never not been set to Brisbane Timezone as has Router. But resetting the smart plugs has indeed corrected the issue, so thank you for that suggestion. But it does...

Addition - I have a TP-Link AX3000 4-Stream Wi-Fi 6 Router, and I have checked the timezone settings on the router and they are set to Brisbane timezone, i.e. a constant UTC+10.

I reside in Brisbane, Australia, which does not observe daylight saving time and remains consistently at UTC+10. In contrast, Sydney observes daylight saving, shifting from UTC+10 during April to...