Because it will be inaccurate.

@WonderWartHog99
Ummm - why would it be less accurate than setting them ahead at 2am?
Isn’t the whole thing somewhat random and arbitrary?

@Haemish1 From noon until two in the morning, the clock would be inaccurate. The questionable point is to establish a weekend when the change would result in people enjoying more day time after work.

For this to work, they need some date around the start of fall. This has valid objections which is why some US states no longer use it.

@WonderWartHog99
Wouldn’t more people enjoy a shorter work day and a longer weekend?
The inaccuracy remains, regardless of when the change actually occurs.

@Haemish1 The inaccuracy remains, regardless of when the change actually occurs.

In terms of clocks, the ultimate standard of accuracy is provided by U.S. Naval Observatory. Clocks that agree with that clock are considered accurate.

What people would enjoy instead has nothing to do with the time of day. What I would enjoy would make young women say "no way, Jose."

@WonderWartHog99
We could debate whether the cesium fountain clock at the National Institute of Standards and Technology in Boulder, Colorado or the the one you mention in Annapolis is the standard for the nation, but it seems that my attempt at humor fell flat with you.

@Haemish1 >We could debate . . .

According to my shameless impartial standards, I'd win.

@WonderWartHog99
At least one of us has standards

@Haemish1 I have a high standard of standardness. You may not have that high a standards. Your standards might be sober.