Question

日期型数据如何比较大小

Answer 1

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

public class test {

public static void main(String args[]) {
int i= compare_date("1995-11-12 15:21", "1999-12-11 09:59");
System.out.println("i=="+i);
}

public static int compare_date(String DATE1, String DATE2) {

DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm");
try {
Date dt1 = df.parse(DATE1);
Date dt2 = df.parse(DATE2);
if (dt1.getTime() > dt2.getTime()) {
System.out.println("dt1 在dt2前");
return 1;
} else if (dt1.getTime() < dt2.getTime()) {
System.out.println("dt1在dt2后");
return -1;
} else {
return 0;
}
} catch (Exception exception) {
exception.printStackTrace();
}
return 0;
}
}

Answer 2

java.util.Date nowdate=new java.util.Date();
String myString = "2008-09-08";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd", Locale.CHINA);
Date d = sdf.parse(myString);

boolean flag = d.before(nowdate);
if(flag)
System.out.print("早于今天")
else
System.out.print("晚于今天")
数据库的就直接比较符就行