use DateUtils;

Edit1.Text:=intToStr(MonthsBetween(StrToDateTime(‘2012-10-2‘),StrToDateTime(‘2012-5-1‘)));
Edit1.Text:=intToStr(MonthsBetween(DateTimePicker2.Date,DateTimePicker1.Date));

delphi 计算l两个日期的时间间隔月数，月数差