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  • Java – How to get current date time

    Java – How to get current date time

    1. Code Snippets
    For java.util.Date, just create a new Date()


    DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    Date date = new Date();
    System.out.println(dateFormat.format(date)); //2016/11/16 12:08:43
    For java.util.Calendar, uses Calendar.getInstance()


    DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    Calendar cal = Calendar.getInstance();
    System.out.println(dateFormat.format(cal)); //2016/11/16 12:08:43
    For java.time.LocalDateTime, uses LocalDateTime.now()


    DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");
    LocalDateTime now = LocalDateTime.now();
    System.out.println(dtf.format(now)); //2016/11/16 12:08:43
    For java.time.LocalDate, uses LocalDate.now()


    DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy/MM/dd");
    LocalDate localDate = LocalDate.now();
    System.out.println(dtf.format(localDate)); //2016/11/16


    2. Full Example
    Review a full Java example to show you how to get the current date, time and display in a predefined format.

    GetCurrentDateTime.java

    package com.mkyong;

    import java.text.DateFormat;
    import java.text.SimpleDateFormat;
    import java.time.LocalDateTime;
    import java.time.format.DateTimeFormatter;
    import java.util.Calendar;
    import java.util.Date;

    public class GetCurrentDateTime {

    private static final DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
    private static final DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");

    public static void main(String[] args) {

    Date date = new Date();
    System.out.println(sdf.format(date));

    Calendar cal = Calendar.getInstance();
    System.out.println(sdf.format(cal.getTime()));

    LocalDateTime now = LocalDateTime.now();
    System.out.println(dtf.format(now));

    LocalDate localDate = LocalDate.now();
    System.out.println(DateTimeFormatter.ofPattern("yyy/MM/dd").format(localDate));

    }

    }
    Output


    2016/11/16 12:08:43
    2016/11/16 12:08:43
    2016/11/16 12:08:43
    2016/11/16
    http://www.mkyong.com/java/java-how-to-get-current-date-time-date-and-calender/
    http://www.mkyong.com/tutorials/java-date-time-tutorials/

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  • 原文地址:https://www.cnblogs.com/shy1766IT/p/10105210.html
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