想要得到形如2018.07.09的格式化好的当天日期 创建Date对象,调用SimpleDateFormat对象的format方法: indexstr="logstash-"+new SimpleDateFormat("yyyy.MM.dd").format(new Date());
package com.ob; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; public class DateTest { public static void main(String[] args) throws ParseException { Calendar now = Calendar.getInstance(); System.out.println("年: " + now.get(Calendar.YEAR)); System.out.println("月: " + (now.get(Calendar.MONTH) + 1) + ""); System.out.println("日: " + now.get(Calendar.DAY_OF_MONTH)); System.out.println("时: " + now.get(Calendar.HOUR_OF_DAY)); System.out.println("分: " + now.get(Calendar.MINUTE)); System.out.println("秒: " + now.get(Calendar.SECOND)); System.out.println("当前时间毫秒数:" + now.getTimeInMillis()); System.out.println(now.getTime()); Date d = new Date(); System.out.println(d); SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String dateNowStr = sdf.format(d); System.out.println("格式化后的日期:" + dateNowStr); String str = "2012-1-13 17:26:33"; //要跟上面sdf定义的格式一样 Date today = sdf.parse(str); System.out.println("字符串转成日期:" + today); } }
输出结果:
年: 2012
月: 1
日: 13
时: 17
分: 28
秒: 19
当前时间毫秒数:1326446899902
Fri Jan 13 17:28:19 CST 2012
Fri Jan 13 17:28:19 CST 2012
格式化后的日期:2012-01-13 17:28:19
字符串转成日期:Fri Jan 13 17:26:33 CST 2012
参考https://blog.csdn.net/qq_29347295/article/details/77482694
原文地址:https://www.cnblogs.com/zealousness/p/9362383.html
时间: 2024-10-25 10:17:14