How does the game define "Earth Time"?

[Hasrat]

If you learn the daylight times instead, when we're no longer on daylight time, resets will happen when you think you still have an hour left.

To be fair, that whole system is so broken/dumb, DT is literally longer than ST. So technically, probably actually better to remember DT, since you're spending less time in ST anyway.

(or we could finally wise up and just stop changing the clocks all the time)

[Rongway]

probably actually better to remember DT, since you're spending less time in ST anyway.

If you only ever remember the resets in the DT frame of reference, you'll have as much time as you think you have to complete your goal, during 65% of the year; and you'll have an hour less than you think, during 35% of the year.

If you only ever remember the ST frame, you'll have at least as much time as you think you have to complete your goal, during 100% of the year.
I respectfully submit that this makes remembering the ST times the far better choice.

Besides that, in PST, most resets are either midnight or noon.