Setting the clock ahead to see what breaks
For anyone designing new systems that store or transmit time, you should be aware of TAI64. https://cr.yp.to/libtai/tai64.html
Unless you are dealing with scheduling, or generating events with a particular cadence (e.g. daily, weekly, monthly) there is no reason to include UTC or time zones in your data model. They are view only concepts, with conversion to the local display format happening from TAI64 on the way out.