WEEKS ("2002- 19- 02"; "2002- 19- 02"; 1) retorna 0, perquè no hi ha cap setmana sencera entremig, començant pel primer dia de la setmana (dilluns o diumenge, depenent dels vostres paràmetres locals)
WEEKS("2002-19-02 ";" 2002-19-02 "; 1) returns 0, because there is not a whole week in between, starting at the first day of the week (monday or sunday, depending on your local settings)