"Please arrive on time."

Translation: 请准时到。

[RobinThor]

Why 请准时到 and not 请到准时?

[David.A.Weldon]

If 请安时到。is not acceptable, could someone explain why? Also, if it is acceptable what are the subtle differences between the two?

[borealopithecus]

请按时到 would be correct