Last Working Day

My contract is 2mths resignation period. 
If i tender on 28 March Is last day on 27 May? But what if 27 May is a non working day. Would the last working day be the next working day on 29May  instead?

27 May will be your last day of service. In the event if your last day of service happened to be non-working day, your last working day shall fall before the last day of seevice. For your case, it would be. 25 May or 26 May, but not 29 May