Conversation so far:
when does the daylight time change in us
Daylight Saving Time started on Mar 8, 2020 at 2 am.
when does the practice of daylight saving time end in 2020
Daylight Saving Time ends on November 1, 2020 at 2 am.

Question: how did the system come into place
Self-contained rewrite: how did the system of daylight saving time come into place