For people who change company. How do you go about telling your next employer about serving notice?

Used to be 1 month when I started. But my current job need 3 months period.

Does the next employer really willing to wait 3 months or do you guys resign first and able to give a date on when you can start work?

As for me
Yr 1 : 3800 (manufacturing engineer)
Yr 2 : 3887
Yr 3 : 4200 ( change job : electrical engineer, construction)
Yr 4 : 5100 ( change job : semicon)