SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd" );
String Nowdate = sdf.format(new Date());//获取当前时间
String Nowdate = sdf.format(new Date());//获取当前时间
String validDate= "2016-11-23"; //到期时间
if(sdf.parse(Nowdate).getTime() > sdf.parse(validDate).getTime()){
return "当前时间大于到期时间";
}esle{
return "当前时间小于到期时间";
}