Advance warning of hours change

[KRUSTYMAN]

I'm sure this must have been covered before but when I checked it came back with nothing found. However, my nephew normally works from 7 'til 5 everyday but he got a call today (he's got a day off) telling him to report for work tomorrow at 8 and from now on his hours will be 8 'til 6. Surely he has to have at least some weeks advance warning?

[factor-fiction]

How long has he worked there?
How much notice doe sthe employer have to give
When you say 'normally' he works 7-5 do you mean he has always worked those hours?

[Eve]

Also, what does his contract and company policy say?