…one assumes, there will be no Daylight Savings Time, once Ahura-Mazda has triumphed and the coming age is entered.

Ah, but since, as you pointed out in your first post on the subject, the Good and Evil are not inherent in the period of being on time or ahead of time, but in the hour of transition, if Ahura-Mazda's triumph abolishes the transition the victory will be a hollow sham. The Good cannot exist without the Evil and in victory will come defeat.