ok, i've analized the problem & the error are that:
if you insert the date in the italian way (like dd/mm/yyyy) and/or you insert a wrong time (not in the format hh:mm) GJ set you to Date 1/1/1970
GJ event read the right date only in this way: mm/dd/yyyy with time: mm:hh
you must insert all the numbers (example: if it's march the 3rd you must write 03/03 & not 3-3 or some other way!)
ok, i've understand now... but how i have to hack if i want to set dd/mm/yyyy & not mm/dd/yyyy (italian people usally read the date in that mode!)?
why everything seems so obvious, after someone told it to you?