Recently in Samoa, the clocks were advanced 24 hours.

Answer

Advancing the clocks 24 hours does not change anything in terms of the Shariah. Such baseless action is not permissible in Islam. It is the duty of the Muslim community to prepare their own calendar reflecting the correct days and dates. Just as we have our own Islamic calendar, so too should a calendar be prepared to show the correct days corresponding with the dates. Regarding the particular occasion mentioned by you, the 'Saturday' was in reality Friday. Therefore Jumuah Salaat had to be conducted on that so-called 'Saturday'.