Hello @Nogueira1306 , thanks for your answer,
Even with "Set( _dateSelected, Today() );", it's not working, and I got 2 errors "number of invalid arguments : 1 were received, 2 were expected", and "unexpected characters, the formula contains "ParentClose" while "error" is expected.".
Moreover, when I overview the Set function, it tells me the syntax "Set(variable; value)", that's why i'm asking about documentation that is outdated.