使用 Java Calendar 的 before() 方法比较日期时间


Calendar.before() 方法返回此 Calendar 的时间是否早于指定的对象所表示的时间。

首先,我们设置一个在过去的时间(过去时间)

Calendar beforeDate = Calendar.getInstance();
beforeDate.set(Calendar.YEAR, 2010);
beforeDate.set(Calendar.MONTH, 05);
beforeDate.set(Calendar.DATE, 30);

以下是我们的日期,11-22-2018

Calendar currentDate = Calendar.getInstance();

现在,使用 before() 方法比较两个日期,如下例所示

示例

 在线示例

import java.util.Calendar;
public class Demo {
   public static void main(String[] args) {
      Calendar beforeDate = Calendar.getInstance();
      beforeDate.set(Calendar.YEAR, 2010);
      beforeDate.set(Calendar.MONTH, 05);
      beforeDate.set(Calendar.DATE, 30);
      java.util.Date dt = beforeDate.getTime();
      System.out.println("Past Date = "+dt);
      Calendar currentDate = Calendar.getInstance();
      System.out.println("Current date = " + (currentDate.get(Calendar.MONTH) + 1) + "-" +
      currentDate.get(Calendar.DATE) + "-" + currentDate.get(Calendar.YEAR));
      System.out.println("Date "+dt+ " is before current date? = " +          beforeDate.before(currentDate));
      }
}

输出

Past Date = Wed Jun 30 13:14:28 UTC 2010
Current date = 11-22-2018
Date Wed Jun 30 13:14:28 UTC 2010 is before current date? = true

更新于: 27-Jun-2020

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