In Ancient Greek οπότε means 'whenever'.
In Modern Greek οπότε means 'thus/therefore'.
In Modern Greek όποτε means 'whenever'.
This strikes me as odd. Why did the Modern Greek language chose to move the accent one position to the begining of the word when it means 'whenever'? And where does the Modern Greek οπότε 'thus/therefore' come from (which in Ancient Greek means 'whenever')?