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  • How to get current timestamps in Java

    How to get current timestamps in Java

    Timestamp timestamp = new Timestamp(System.currentTimeMillis());
    //2016-11-16 06:43:19.77

    Here are two Java examples to show you how to get current timestamps in Java. (Updated with Java 8)

    1. java.sql.Timestamp
    Two methods to get the current java.sql.Timestamp

    TimeStampExample.java
    package com.mkyong.date;

    import java.sql.Timestamp;
    import java.text.SimpleDateFormat;
    import java.util.Date;

    public class TimeStampExample {

    private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd.HH.mm.ss");

    public static void main(String[] args) {

    //method 1
    Timestamp timestamp = new Timestamp(System.currentTimeMillis());
    System.out.println(timestamp);

    //method 2 - via Date
    Date date = new Date();
    System.out.println(new Timestamp(date.getTime()));

    //return number of milliseconds since January 1, 1970, 00:00:00 GMT
    System.out.println(timestamp.getTime());

    //format timestamp
    System.out.println(sdf.format(timestamp));

    }

    }

    Output

    2016-11-16 06:43:19.77
    2016-11-16 06:43:19.769
    1479249799770
    2016.11.16.06.43.19



    2. java.time.Instant
    In Java 8, you can convert java.sql.Timestamp to the new java.time.Instant

    InstantExample.java
    package com.mkyong.date;

    import java.sql.Timestamp;
    import java.time.Instant;

    public class InstantExample {

    public static void main(String[] args) {

    Timestamp timestamp = new Timestamp(System.currentTimeMillis());
    System.out.println(timestamp);

    //return number of milliseconds since January 1, 1970, 00:00:00 GMT
    System.out.println(timestamp.getTime());

    // Convert timestamp to instant
    Instant instant = timestamp.toInstant();
    System.out.println(instant);

    //return number of milliseconds since the epoch of 1970-01-01T00:00:00Z
    System.out.println(instant.toEpochMilli());

    // Convert instant to timestamp
    Timestamp tsFromInstant = Timestamp.from(instant);
    System.out.println(tsFromInstant.getTime());

    }

    }

    Output

    2016-11-16 06:55:40.11
    1479250540110
    2016-11-15T22:55:40.110Z
    1479250540110
    1479250540110
    http://www.mkyong.com/java/how-to-get-current-timestamps-in-java/
    http://www.mkyong.com/tutorials/java-date-time-tutorials/

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  • 原文地址:https://www.cnblogs.com/shy1766IT/p/10105240.html
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