They have to give you 24 hour notice of a start time change. So if they tell you at 4pm today to come in 30 min later tomorrow, that is not a 24 hour notice. Punch in at your normal start time and tell your manager to find you something to do.
They can also not make you take a break, especially if it's been less than an hour since you punched in. If they want you to take a break while waiting for freight you do not have to, but instead find some busy work for yourself like sweep the warehouse or clean your truck. Don't let them bully you to suit them.
Yes. And if you want to mess with them more, a lot of state have laws mandating breaks within the first ___ hours of work. This is especially effective if you are an RTD that starts at 0330 and there is late freight. "Sorry, I can't leave the ramp because I need to take my state-mandated break".
Show-up, tell them you're ready for work, and go onto a Code 43 if they don't assign you something. It always amazes me how many people go along with having Fred steal a couple of hours of pay from them so he can make more money and have increased efficiency.
Not our problem if the plane or CTV is late...it's Fred's. Don't cheat yourself.
To flip it around, tell your manager next time you oversleep or your kid needs to go to Urgent Care that you needed to change your start time to meet your operational needs. See where that one goes.