If your employment letter says 1mth notice, then you should serve 1mth notice. Don't care what the boss or whoever admin, manager, etc, say in your company. You know the reason why they ask you to give resignation letter for 2 weeks notice is that they will spin around and ask you to pay 1mth in lieu of for notice. My boss also has the tendency to do things like that also. But always, ALWAYS follow what your offer letter say, as that's already black and white.

follow what your offer letter say...

early release is the prerogative of the employer. that is if u have a good boss or u performed bad enough for them to kick u out earlier

Follow ur offer letter. But if early release, then this is up to ur supervisor ady.

If you don't agree to it, they can't make you do anything. It goes both ways.