Please be on time should be accepted
Isn't 准时 pronounced zhun3 shi2? I am hearing zhui3 shi2.
And I am hearing zhuǎn shí!
How about please be punctual? You translate準時 as punctual in another question
Is zhui shi a regional pronunciation? I thought it was zhun shi.
准 : on ?
That's not how translation works. You have translate the words and ideas, not each character. Get a chinese dictionary app and look up the character. 准 is more like standard or exact in this case.
No, more like "accurate". So literally more like "please accurate time arrive". Using "on" is an English idiomatic expression as you are literally ON nothing.