使用compareTo:

date1.compareTo (date2);

这段代码确定今天是在一段时间内。基于韩国地区

    Calendar cstart = Calendar.getInstance(Locale.KOREA);
    cstart.clear();
    cstart.set(startyear, startmonth, startday);


    Calendar cend = Calendar.getInstance(Locale.KOREA);
    cend.clear();
    cend.set(endyear, endmonth, endday);

    Calendar c = Calendar.getInstance(Locale.KOREA);

    if(c.after(cstart) && c.before(cend)) {
        // today is in startyear/startmonth/startday ~ endyear/endmonth/endday
    }

这个方法对我很管用:

 public static String daysBetween(String day1, String day2) {
    String daysBetween = "";
    SimpleDateFormat myFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    try {
        Date date1 = myFormat.parse(day1);
        Date date2 = myFormat.parse(day2);
        long diff = date2.getTime() - date1.getTime();
        daysBetween = ""+(TimeUnit.DAYS.convert(diff, TimeUnit.MILLISECONDS));
    } catch (ParseException e) {
        e.printStackTrace();
    }
    return daysBetween;
}

比较这两个日期:

  Date today = new Date();                   
  Date myDate = new Date(today.getYear(),today.getMonth()-1,today.getDay());
  System.out.println("My Date is"+myDate);    
  System.out.println("Today Date is"+today);
  if (today.compareTo(myDate)<0)
      System.out.println("Today Date is Lesser than my Date");
  else if (today.compareTo(myDate)>0)
      System.out.println("Today Date is Greater than my date"); 
  else
      System.out.println("Both Dates are equal"); 

以下是比较日期的最常用方法(我的首选方法1):

方法1:使用Date.before()， Date.after()和Date.equals()

if (date1.after(date2)) {
    System.out.println("Date1 is after Date2");
}

if (date1.before(date2)) {
    System.out.println("Date1 is before Date2");
}

if (date1.equals(date2)) {
    System.out.println("Date1 is equal Date2");
}

方法2:Date.compareTo()

if (date1.compareTo(date2) > 0) {
    System.out.println("Date1 is after Date2");
} else if (date1.compareTo(date2) < 0) {
    System.out.println("Date1 is before Date2");
} else {
    System.out.println("Date1 is equal to Date2");
}

方法3:calendar .before()， calendar .after()和calendar .equals()

Calendar cal1 = Calendar.getInstance();
Calendar cal2 = Calendar.getInstance();
cal1.setTime(date1);
cal2.setTime(date2);

if (cal1.after(cal2)) {
    System.out.println("Date1 is after Date2");
}

if (cal1.before(cal2)) {
    System.out.println("Date1 is before Date2");
}

if (cal1.equals(cal2)) {
    System.out.println("Date1 is equal Date2");
}

Date有前后两种方法，它们之间的比较如下:

if(todayDate.after(historyDate) && todayDate.before(futureDate)) {
    // In between
}

要进行包容性比较:

if(!historyDate.after(todayDate) && !futureDate.before(todayDate)) {
    /* historyDate <= todayDate <= futureDate */ 
}

你也可以试试Joda-Time，但请注意:

Joda-Time是Java SE 8之前的Java事实上的标准日期和时间库。现在要求用户迁移到java。时间(jsr - 310)。

后端端口可用于Java 6和7以及Android。