JP Simões has created the formula for the George Score for the Englisch edition of Excel. I've translated the formula for different edtions of Excel.
'Notes' = a rangename for a cell with your total notes entered
'Hist' = a rangename for a cell with your total hits
'Last_note_entered' = a rangename for a cell with the date of your last entrydate

=100*(SQRT(LN(Notes))+LN(Hits+1))*(1-((TODAY()-ROUNDDOWN(Last_note_entered,0))/100))

=100*(WORTEL(LN(Notes))+LN(Hits+1))*(1-((VANDAAG()-AFRONDEN.NAAR.BENEDEN(Last_note_entered;0))/100))

=100*(WURZEL(LN(Notes))+LN(Hits+1))*(1-((HEUTE()-ABRUNDEN(Last_note_entered;0))/100))

=100*(RACINE(LN(Notes))+LN(Hits+1))*(1-((AUJOURDHUI()-ARRONDI.INF(Last_note_entered;0))/100))

=100*(RADQ(LN(Notes))+LN(Hits+1))*(1-((OGGI()-ARROTONDA.PER.DIF(Last_note_entered;0))/100))

=100*(RAIZ(LN(Notes))+LN(Hits+1))*(1-((HOY()-REDONDEAR.MENOS(Last_note_entered;0))/100))

=100*(RAIZQ(LN(Notes))+LN(Hits+1))*(1-((HOJE()-ARRED.PARA.BAIXO(Last_note_entered;0))/100))

=100*(NELIÖJUURI(LUONNLOG(Notes))+LUONNLOG(Hits+1))*(1-((TÄMÄ.PÄIVÄ()-PYÖRISTÄ.DES.ALAS(Last_note_entered;0))/100))