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Table of contents
1.
Introduction
2.
What is Java Timestamp?
2.1.
Syntax of Java Timestamp
2.2.
Constructors of Java Timestamp
2.3.
Methods of Java Timestamp
2.4.
Example
2.5.
Advantages of Java Timestamp
3.
Frequently Asked Questions
3.1.
What is a Java Timestamp?
3.2.
How can I create a Java Timestamp?
3.3.
What is the difference between java.sql.Timestamp and java.util.Date?
3.4.
What is the process for changing a string into a Java Timestamp?
3.5.
How do I get the current Java Timestamp?
4.
Conclusion
Last Updated: Mar 27, 2024
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Java Timestamp

Author Aditya Gupta
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Introduction

Hey there! Java timestamps will be the topic of our discussion today. A timestamp is similar to a unique code that aids in timekeeping. A timestamp is a code that reveals the precise time something occurred or was made, much like how we use a clock or watch to know the time. To keep track of when events happen within a program, Java uses timestamps. 

java timestamp

When playing a game, we can utilise timestamps to keep track of a player's game-start time, level completion time, and job completion time. Now Let’s look at the actual concept behind Java timestamps by Understanding its concept, and syntax along with its examples.

What is Java Timestamp?

A unique form of data called a Java Timestamp captures an exact point in time down to the millisecond. In other words, it works as a unique code that tells us about a particular moment in time. 

Java timestamps track when an action occurred or a program component was created, modified, or updated. They are frequently employed in scientific research, financial applications, and other fields that call for exact time data. The time difference between two events can be calculated, compared, and determined using Java Timestamps. For managing time-related data in Java programmes, they are an important tool.

Syntax of Java Timestamp

Timestamp timestamp = new Timestamp(milliseconds);

Constructors of Java Timestamp

Java provides two constructors for the Timestamp class:

Timestamp(long milliseconds)

  • Creates an object called a Timestamp that contains the number of milliseconds that have passed since January 1st, 1970, at 00:00:00 UTC.
     

Timestamp(int year, int month, int date, int hour, int minute, int second, int nano)

  • creates a Timestamp object with the given time and date.

Methods of Java Timestamp

Java's Timestamp class offers a number of practical ways for working with timestamps.

  • after(Timestamp ts)
    Returns true if the Timestamp object is later than the specified Timestamp object ts; otherwise, returns false.
     
  • before(Timestamp ts)
    Returns true if the Timestamp object is earlier than the specified Timestamp object ts; otherwise, returns false.
     
  • compareTo(Timestamp ts)
    Compares the Timestamp object to the specified Timestamp object ts.
     
  • equals(Object o)
    Returns true if the Timestamp object is equal to the specified object o, otherwise returns false. Two Timestamp objects are considered equal if they represent the same point in time.
     
  • getNanos()
    Returns the nanosecond value of the Timestamp object.
     
  • getTime()
    Returns the number of milliseconds since January 1st, 1970 at 00:00:00 UTC represented by this Timestamp object.
     
  • hashCode()
    Returns a hash code value for the Timestamp object.
     
  • setNanos(int n)
    Sets the nanosecond value of the Timestamp object to the specified value n.
     
  • toString()
    Returns a string representation of Timestamp object in the format yyyy-MM-dd HH:mm:ss.SSS.
     
  • valueOf(String s)
    Converts the specified string representation of a timestamp into a Timestamp object.
    The string must be in the format yyyy-MM-dd HH:mm:ss.SSS.
     
  • from(Instant instant)
    Obtains a Timestamp object representing the same point in time as the specified Instant object.
     
  • toInstant()
    Converts Timestamp object to an Instant object.
     
  • toLocalDateTime()
    Converts Timestamp object to a LocalDateTime object.
     
  • toLocalDate()
    Converts Timestamp object to a LocalDate object.
     
  • toLocalTime()
    Converts Timestamp object to a LocalTime object.
     
  • valueOf(LocalDateTime dateTime)
    Obtains a Timestamp object representing the same point in time as the specified LocalDateTime object.

Example

Here is an illustration of how to use Java's Timestamp class:

import java.sql.Timestamp;
public class TimestampExample {
    public static void main(String[] args) {
        // Create a new Timestamp object with the current time
        Timestamp currentTimestamp = new Timestamp(System.currentTimeMillis());
        System.out.println("Current timestamp: " + currentTimestamp);
        
        // Create a new Timestamp object from a string representation
        String timestampString = "2022-04-23 12:34:56.789";
        Timestamp parsedTimestamp = Timestamp.valueOf(timestampString);
        System.out.println("Parsed timestamp: " + parsedTimestamp);

        // Compare two Timestamp objects
        if (currentTimestamp.after(parsedTimestamp)) {
            System.out.println("Current timestamp is later than parsed timestamp");
        } else if (currentTimestamp.before(parsedTimestamp)) {
            System.out.println("Current timestamp is earlier than parsed timestamp");
        } else {
            System.out.println("Current timestamp and parsed timestamp are equal");
        }
    }
}


Output

output

Explanation

Using the Timestamp(long time) constructor, we first build a new Timestamp object in this example. We supply System.currentTimeMillis() as an input to obtain the current time. The valueOf(String s) method parses a string representation of a timestamp in the format yyyy-MM-dd HH:mm:ss.SSS, is then used to build a new Timestamp object. To determine whether the two Timestamp objects is earlier or later, we compare them using the after(Timestamp ts) and before(Timestamp ts) methods.

Advantages of Java Timestamp

Java timestamp is a class in Java that represents a point in time. Here are a few advantages of Java timestamp. 

  • Java Timestamp provides a high level of precision up to nanoseconds.
     
  • It is easy to work with date and time information from different parts of the world, as Java Timestamp has support for different timezones.
     
  • Java Timestamp can be used in multi-threaded environments without the risk of data corruption.
     
  • It is compatible with other date and time classes in Java.
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Frequently Asked Questions

What is a Java Timestamp?

A Java timestamp represents a particular moment in time, measured in milliseconds.

How can I create a Java Timestamp?

The java.sql.Timestamp class or the java.util.Date class can be used to construct a Java timestamp.

What is the difference between java.sql.Timestamp and java.util.Date?

Both classes represent a point in time, but java.sql.Timestamp provides greater precision, storing the number of nanoseconds as well as milliseconds.

What is the process for changing a string into a Java Timestamp?

A string can be converted into a Java timestamp using the java.sql.Timestamp.valueOf() method or the java.text.SimpleDateFormat.parse() method.

How do I get the current Java Timestamp?

A new instance of the current time can be created by using the java.sql.Timestamp constructor or the java.util.Date constructor without any arguments.

Conclusion

This article discusses the topic of Java timestamp. We hope this blog has helped you enhance your knowledge of Java timestamp. If you want to learn more, then check out our articles.

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