New Zealand Law
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If they have a history of paying you for all of the time which you actually clocked in for, then to change this to a system where you only get paid for agreed hours, is a disadvantage in your employment contract. This would entitle you to raise a personal grievance for the change to the payment system. Of course if you are required to clock in, but are only paid from the adjusted time, you do not need to actually start work until the adjusted time, and you can stop work at the adjusted time. If your employer wants you to do this, instead of carrying on work as you do it present, they may have to compensate you for the small decrease in your pay.
The issue is whether you want to go to the trouble of claiming a personal grievance, which would require an employment mediation, and if they did not agree a hearing before the Employment Relations Authority