Java get timestamp now

5 Methods to Get Current TimeStamp in JAVA

Timestamps are vital in various programming scenarios, such as logging events, tracking system changes, or measuring performance. In Java, obtaining the current timestamp can be accomplished using several methods. This article will explore different approaches to getting the current timestamp in Java, and demonstrate their use with examples.

Method 1: Using System.currentTimeMillis()

The System.currentTimeMillis() method provides the simplest way to obtain the current timestamp in Java. This method returns the current time in milliseconds since the Unix epoch (January 1, 1970, 00:00:00 GMT).

This code snippet will output the current timestamp in milliseconds, like:

OUtput:
 Current Timestamp: 1648628115654 milliseconds

Method 2: Using java.util.Date

The java.util.Date class allows you to obtain the current timestamp as a Date object. The Date object represents a specific instant in time, with millisecond precision.

This code snippet will output the current timestamp in milliseconds, similar to the previous example:

OUtput:
 Current Timestamp: 1648628115654 milliseconds

Method 3: Using java.time.Instant

Java 8 introduced a new date and time API in the java.time package. The java.time.Instant class represents an instantaneous point on the time-line and can be used to obtain the current timestamp.

System . out . println ( «Current Timestamp: » + currentInstant . toEpochMilli ( ) + » milliseconds» ) ;

This code snippet will output the current timestamp in milliseconds , similar to the previous examples :

OUtput:
 Current Timestamp: 1648628115654 milliseconds

Method 4: Using java.time.LocalDateTime and java.time.ZoneId

The java.time.LocalDateTime class represents a date-time without a time-zone, while the java.time.ZoneId class represents a time-zone identifier. You can use these classes together to obtain the current timestamp in a specific time-zone.

This code snippet will output the current timestamp in milliseconds and a formatted date-time string:

OUtput:
 Current Timestamp: 1648628115654 milliseconds Formatted Date-Time: 2023-03-30 14:35:15

Method 5: Using java.sql.Timestamp

The `java.sql.Timestamp` class is part of the Java SQL package and represents a date-time value suitable for database storage and retrieval. This class can be used to obtain the current timestamp as well.

System . out . println ( «Current Timestamp: » + currentTimestamp . getTime ( ) + » milliseconds» ) ;

This code snippet will output the current timestamp in milliseconds and a formatted timestamp string:

OUtput:
 Current Timestamp: 1648628115654 milliseconds Formatted Timestamp: 2023-03-30 14:35:15.654

Conclusion

This article has explored five different methods for obtaining the current timestamp in Java, each with its advantages and use cases. Depending on your requirements and the version of Java you are using, you can choose the method that best fits your needs. Whether you need a simple millisecond value or a more complex date-time object, Java provides multiple ways to acquire the current timestamp. By understanding these methods, you can efficiently implement timestamp functionality in your applications and take advantage of the power of Java’s date and time handling capabilities.

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Get Current Timestamp in Java

In Java, the timestamps are represented with the following classes:

1. Get Current Timestamp with Instant

The Instant represents a unique point in the timeline and is primarily used to record event time-stamps in the application. It is an actual point in time, expressed using UTC – a universal time scale.

Instant instant = Instant.now(); System.out.println(instant); //2022-02-15T08:06:21.410588500Z

2. java.sql.Timestamp (Java 7 or Earlier)

This legacy class has 2 methods to get the current timestamp.

Timestamp timestamp1 = new Timestamp(System.currentTimeMillis()); Date date = new Date(); Timestamp timestamp2 = new Timestamp(date.getTime()); System.out.println(timestamp1); //2022-02-15 13:55:56.18 System.out.println(timestamp2); //2022-02-15 13:55:56.18

3. Instant vs ZonedDateTime

At a high level, Instant and ZonedDateTime classes seem similar but they are not.

• ZonedDateTime is an actual point in time but in a specific timezone.
• Instant is a point of time in UTC.

The value of Instant.now() will be exactly the same in all parts of the words at a time, while the value of ZonedDateTime.now() will be adjusted to the timezone value associated with the instance,

As a rule, consider using the Instant class for storing timestamp values in the database and passing between different applications. And use ZonedDateTime instance for displaying the information to the users in their specific timezones.

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Get current timestamp in java

In this post, we will see how to get current timestamp in java.

There are multiple ways to get current timestamp in java.

Using Java 8’s Instant class

There are three ways to get timestamp using Java 8‘s java.time.Instant class.

Using Instant.now()

Using date.toInstant()

Using timestamp.toInstant()

Here is complete example for get current timestamp in java.

Using java.sql.Timestamp

You can also java.sql.Timestamp to get current Timestamp.

Conclusion

You should use java.time.Instant to get current timestamp in case you are using Java 8 or greater version. If you are using Java 7 or below, then only you should use java.sql.Timestamp to get current timestamp in java.

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