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  • java 日期格式转换,加减等

    将string转换成日期Date

    SimpleDateFormat re = new SimpleDateFormat(String formate);----:yyyy-MM-dd
    System.out.println(re.parse("1990-02-02"));----Fri Feb 02 00:00:00 CST 1990

    将日期转换成String

    SimpleDateFormat sfdate = new SimpleDateFormat(String formate);----:yyyy-MM-dd
    System.out.println( sfdate.format(new Date()));-----2015-09-24

    获取当前时间信息:

    Calendar ca = Calendar.getInstance();
    System.out.println("年----"+ca.get(1));
    System.out.println("月----"+(ca.get(2)+1));
    System.out.println("日----"+ca.get(5));

    结果:

    年----2015
    月----9
    日----24

    多少分钟之后:-----Calendar 类是一个抽象类,

    Calendar 提供了一个类方法 getInstance,以获得此类型的一个通用的对象。Calendar 的 getInstance 方法返回一个 Calendar 对象,其日历字段已由当前日期和时间初始化:

         Calendar rightNow = Calendar.getInstance();

    Calendar ca=Calendar.getInstance();
    ca.setTime(date);
    ca.add(Calendar.MINUTE, delaytime);----12  

    返回日期: date=ca.getTime();

    返回字符串:SimpleDateFormat sfdate = new SimpleDateFormat(String formate);----:yyyy-MM-dd
    System.out.println( sfdate.format(date));

    例子:

    Calendar ca = Calendar.getInstance();

    System.out.println(ca.getTime());
    ca.add(12, 40);----可以为负值
    System.out.println(ca.getTime());

    Thu Sep 24 15:16:20 CST 2015
    Thu Sep 24 15:56:20 CST 2015

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  • 原文地址:https://www.cnblogs.com/qianduanxiaocaij/p/4835423.html
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