A Date object has to be initialized with a date, this date may be displayed in many formats. Each Date object holds one date value, it may be changed using the provided methods. You may have better options to handle multilingual dates, check out strftime() function in the PHP documentation. This class supports many european languages: Italian (it), English (en), Spanish (es), French (fr) and German (de)
sets the date using the Italian short format dd/mm/yyyy - d/m/yyyy is also accepted. It's better to use 4 digits year, but works with 2 digits too, as explained in setYear().
Month and Day are left unchanged to the previous value. if you use 2 digit year then 0-69 is mapped to 2000-2069 and 70-99 to 1970-1999. whenever you can, use 4 digit year.