Date类型转换为String类型的时间
Date returnDate=new Date();
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm");
String newdataone =sdf.format(returnDate);
String类型转换为Date类型的时间
String newtime="2019-07-03";
/设置时间格式
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
Date datatime= sdf.parse(newtime);
两个时间比较前后
Date returnDate=new Date();
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
String newdataone =sdf.format(returnDate);
Date datatime= sdf.parse(newdataone);
SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
String daytime= "2019-07-03";
Date newday= sdf.parse(daytime);
Calendar calendar = Calendar.getInstance();
calendar.setTime(newday);
calendar.add(Calendar.DATE, 1);
if(datatime.before (sdf.format(calendar.getTime()))){
alert("datatime的时间比(sdf.format(calendar.getTime()))之前")
}
if(sdf.format(calendar.getTime()).after(datatime)){
alert("(sdf.format(calendar.getTime()))的时间比datatime之后")
}