JAVA中日期格式SimpleDateFormat_import java.text.simpledateformat;-优快云博客

本文链接：https://blog.youkuaiyun.com/csdnluolei/article/details/84564068

本文通过四个Java类的示例，展示了如何使用SimpleDateFormat进行日期时间的解析和格式化，包括24小时制与12小时制的区别，以及不同日期格式字符串的影响。

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

public class Test {

	public static void main(String[] args) {
		
		String date = "2018-11-27 13:10:18";
		//24小时制
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		//12小时制
		SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

		try {
			Date date1 = sdf.parse(date);
			Date date2 = sdf2.parse(date);
			System.out.println(sdf.format(date1));  //2018-11-27 13:10:18
			System.out.println(sdf2.format(date2)); //2018-11-27 01:10:18

		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}

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

public class Test2 {

	public static void main(String[] args) {
		
		String date = "2018-11-27 13:10:18";
	
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-DD HH:mm:ss");

		SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

		try {
			Date date1 = sdf.parse(date);
			Date date2 = sdf2.parse(date);
			System.out.println(sdf.format(date1));  //2018-01-27 13:10:18
			System.out.println(sdf2.format(date2)); //2018-11-27 13:10:18

		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}

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

public class Test3 {

	public static void main(String[] args) {
		
		String date = "2018-11-27 13:10:18";
	
		SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss");

		SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

		try {
			Date date1 = sdf.parse(date);
			Date date2 = sdf2.parse(date);
			System.out.println(sdf.format(date1));  //2018-12-31 13:10:18
			System.out.println(sdf2.format(date2)); //2018-11-27 13:10:18
			
			
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}

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

public class Test4 {

	public static void main(String[] args) {
		
		String date = "2018-11-27 13:10:18";
	
		SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-DD HH:mm:ss");

		SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

		try {
			Date date1 = sdf.parse(date);
			Date date2 = sdf2.parse(date);
			System.out.println(sdf.format(date1));  //2018-12-365 13:10:18
			System.out.println(sdf2.format(date2)); //2018-11-27 13:10:18

		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}