Hello, First I'm a beginner so please be lenient. Well I'm trying to convert date in order to get the yesterday using the regionnal env of my computer ( I'm French ) So I'm able to do that : get - date - UFormat % A And getting correctly "Jeudi" ( Thursday ) I'm able to do that : (get-date).adddays(-1).dayofweek And I'm getting Wednesday but I need it in French. So 'Im regarding to do this : (get-date).adddays(-1).dayofweek -UFormat %A But without sucess, any