【Java脱坑指南】利用Calendar获取当前月第一天、最后一天，前月第一天、最后一天

最新推荐文章于 2024-07-20 03:04:13 发布

harryperlau

最新推荐文章于 2024-07-20 03:04:13 发布

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分类专栏： Java脱坑指南文章标签： java

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import java.util.*;
import java.text.*;

public class Test {
	
	public static void main(String[] args) {
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		// 获取当前月第一天
        Calendar nowFirst = Calendar.getInstance();
        nowFirst.set(Calendar.DAY_OF_MONTH, 1);
        nowFirst.set(Calendar.HOUR_OF_DAY, 0);
        nowFirst.set(Calendar.MINUTE, 0);
        nowFirst.set(Calendar.SECOND, 0);
        String curMonthFirst = format.format(nowFirst.getTime());
        System.out.println("=============== nowfirst:" + curMonthFirst);
		
		// 获取当前月最后一天
        Calendar nowLast = Calendar.getInstance();
        nowLast.set(Calendar.DAY_OF_MONTH, nowLast.getActualMaximum(Calendar.DAY_OF_MONTH));
        nowLast.set(Calendar.HOUR_OF_DAY, 23);
        nowLast.set(Calendar.MINUTE, 59);
        nowLast.set(Calendar.SECOND,59);
        String curMonthLast = format.format(nowLast.getTime());
        System.out.println("=============== nowLast:" + curMonthLast);
		
		// 获取前月第一天
		Calendar preFirst = Calendar.getInstance();
		preFirst.add(Calendar.MONTH, -1);
		preFirst.set(Calendar.DAY_OF_MONTH, 1);
		preFirst.set(Calendar.HOUR_OF_DAY, 0);
		preFirst.set(Calendar.MINUTE, 0);
		preFirst.set(Calendar.SECOND, 0);
		
		String preMonthFirst = format.format(preFirst.getTime());
        System.out.println("=============== preFirst:" + preMonthFirst);
		
		// 获取前月最后一天
		Calendar preLast = Calendar.getInstance();
		preLast.set(Calendar.DAY_OF_MONTH, 1);
		preLast.set(Calendar.HOUR_OF_DAY, 0);
		preLast.set(Calendar.MINUTE, 0);
		preLast.set(Calendar.SECOND, -1);
		
		String preMonthLast = format.format(preLast.getTime());
        System.out.println("=============== preLast:" + preMonthLast);
	}
	
}