The first parameter will be language of your choice , second parameter will be your date and the last one will be the format , we have 2 predefied formats either 'b' or 'B', Pass lowercase 'b' or 'B' to format your date as per your requirement for example 'MultiLanguageDate.change('dutch', '25/02/2012', 'B')' and the output will be '25 februari 2012' default language will be english and default format will take the current date