java timestamp
Timestamp timestamp = new Timestamp(System.currentTimeMillis());
//2016-11-16 06:43:19.77
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                            java timestamp
Timestamp timestamp = new Timestamp(System.currentTimeMillis());
//2016-11-16 06:43:19.77
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                            java timestamp
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));
        
    }
}
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                            get current unix timestamp java
System.currentTimeMillis() / 1000L;
                                
                            java timestamp
package com.mkyong.app;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Date;
public class TimeStampExample {
    // 2021.03.24.16.34.26
    private static final SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy.MM.dd.HH.mm.ss");
    // 2021-03-24T16:44:39.083+08:00
    private static final SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX");
    // 2021-03-24 16:48:05
    private static final SimpleDateFormat sdf3 = 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);                      // 2021-03-24 16:34:26.666
        // method 2 - via Date
        Date date = new Date();
        System.out.println(new Timestamp(date.getTime()));  // 2021-03-24 16:34:26.666
                                                            // number of milliseconds since January 1, 1970, 00:00:00 GMT
        System.out.println(timestamp.getTime());            // 1616574866666
        System.out.println(sdf1.format(timestamp));         // 2021.03.24.16.34.26
        System.out.println(sdf2.format(timestamp));         // 2021-03-24T16:48:05.591+08:00
        System.out.println(sdf3.format(timestamp));         // 2021-03-24 16:48:05
    }
}
                                
                            java parse unix timestamp
long unixTime = 1577094336;
Instant instant = Instant.ofEpochSecond(unixTime);
// 2019-12-23T09:45:36Z
                                
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