Court is a very serious place and judges take their sessions very seriously and their timing and being exact is very important to them.
According to your case and situation that you're in, you need to find a very strong and concrete reason to convince the judge to change the date.
Surely you must have a lawyer! You should talk to your lawyer and he/she be the one that will do communicate with the judge through them. If your reason is strong enough, you tell your lawyer and then see what happens. If not and still due any reason you wanna try to change the date, talk to your lawyer, they'll know the rules and how to play the game! You can convince your lawyer to try to find or bring something that convince the judge by it.