Last day of week? What's the best choice?

Hi All

using MT4 , I'm a bit lost regarding end of week timing.
My current Week bar starts on monday morning and ends on Sunday evening midnight..

A trading week ,for me, should start on Sunday night ( Australian session openning ) and end on Friday night ( US session closing ).
Am I wrong ?

Any ideas how to overcome this issue ?

Thanks.

different brokers use different times.. download mt4 from a different broker..