Date and time class in Java

 Date and time class:

Java does not have a built-in Date class, but we can import the java.time package to work with the date and time API. The package includes many date and time classes. For example: 

Class	Description
LocalDate	Represents a date (year, month, day (yyyy-MM-dd))
LocalTime	Represents a time (hour, minute, second and nanoseconds (HH-mm-ss-ns))
LocalDateTime	Represents both a date and a time (yyyy-MM-dd-HH-mm-ss-ns)
DateTimeFormatter	Formatter for displaying and parsing date-time objects

Display Current Date

To display the current date, import the java.time.LocalDate class, and use its now() method:

 Example:

package com.java.DataAndTime;

import java.time.LocalDate; // import the LocalDate class

public class Current_date {

public static void main(String[] args) {

LocalDate myObj = LocalDate.now(); // Create a date object

System.out.println(myObj); // Display the current date

}

}

Display Current Time

To display the current time (hour, minute, second, and nanoseconds), import the java.time.LocalTime class, and use its now() method:

 Example

package com.java.DataAndTime;

import java.time.LocalTime; // import the LocalTime class

public class Current_time {

public static void main(String[] args) {

LocalTime myObj = LocalTime.now();

System.out.println(myObj);

}

}

Display Current Date and Time

To display the current date and time, import the java.time.LocalDateTime class, and use its now() method:

Example

package com.java.DataAndTime;

import java.time.LocalDateTime; // import the LocalDateTime class

public class Current_date_Time {

public static void main(String[] args) {

LocalDateTime myObj = LocalDateTime.now();

System.out.println(myObj);

}

}

Formatting Date and Time

We can use the DateTimeFormatter class with the ofPattern() method in the same package to format or parse date-time objects.

Example

package com.java.DataAndTime;

import java.time.LocalDateTime; // Import the LocalDateTime class

import java.time.format.DateTimeFormatter; // Import the DateTimeFormatter class

public class Formatting_Date_Time {

public static void main(String[] args) {

LocalDateTime myDateObj = LocalDateTime.now();

System.out.println("Before formatting: " + myDateObj);

DateTimeFormatter myFormatObj = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss");

String formattedDate = myDateObj.format(myFormatObj);

System.out.println("After formatting: " + formattedDate);

}

}

The ofPattern() method accepts all sorts of values, if you want to display the date and time in a different format. For example:

Value	Example
yyyy-MM-dd	"1988-09-29"
dd/MM/yyyy	"29/09/1988"
dd-MMM-yyyy	"29-Sep-1988"
E, MMM dd yyyy	"Thu Sep 29 1988"