We’ve fixed this in Supernotes 3.1.2 
Additionally, you are now allowed to use “offset-aware” datetimes in order to more easily set a time based on your local time (assuming you know the UTC-offset).
So for example if you are in UTC+8 as I am, you can set a targeted date for noon (local time) like so:
{
"targeted_when": "2024-06-12T12:00:00+08:00"
}