What day would yesterday be if Friday was four days before the day after tomorrow?

My reasoning is thus: If as in the question - Yesterdaywas Saturday then: Today would be Sunday so 'the day after tomorow' would be: Tuesday - -(tomorrow being Monday) and: Friday comes 4 days before Tuesday (on the 7 day loop.....Friday...Saturday...Sunday...Monday...Tuesday......and so on in a loop)