LocalDateTime now() Method in Java with Examples

In LocalDateTime class, there are three types of now() method depending upon the parameters passed to it.

now()

now() method of a LocalDateTime class used to obtain the current date-time from the system clock in the default time-zone.This method will return LocalDateTime based on system clock with default time-zone to obtain the current date-time.

Syntax:

public static LocalDateTime now()

Parameters: This method accepts no parameter.

Return value: This method returns the current date-time using the system clock.

Below programs illustrate the now() method:
Program 1:

// Java program to demonstrate
// LocalDateTime.now() method

import java.time.*;

public class GFG {
    public static void main(String[] args)
    {

        // create an LocalDateTime object
        LocalDateTime lt
            = LocalDateTime.now();

        // print result
        System.out.println("LocalDateTime : "
                           + lt);
    }
}

Output:

LocalDateTime : 2019-01-21T05:47:08.644

now(Clock clock)

now(Clock clock) method of a LocalDateTime class used to return the current date-time based on the specified clock passed as parameter

Syntax:

public static LocalDateTime now(Clock clock)

Parameters: This method accepts clock as parameter which is the clock to use.

Return value: This method returns the current date-time.

Below programs illustrate the now() method:
Program 1:

// Java program to demonstrate
// LocalDateTime.now() method

import java.time.*;

public class GFG {
    public static void main(String[] args)
    {

        // create a clock
        Clock cl = Clock.systemUTC();

        // create an LocalDateTime object using now(Clock)
        LocalDateTime lt
            = LocalDateTime.now(cl);

        // print result
        System.out.println("LocalDateTime : "
                           + lt);
    }
}

Output:

LocalDateTime : 2019-01-21T05:47:20.949

now(ZoneId zone)

now(ZoneId zone) method of a LocalDateTime class used to return the current date-time from system clock in the specified time-zone passed as parameter.Specifying the time-zone avoids dependence on the default time-zone.

Syntax:

public static LocalDateTime now(ZoneId zone)

Parameters: This method accepts zone as parameter which is the zone to use.

Return value: This method returns the current date-time.

Below programs illustrate the now() method:
Program 1:

// Java program to demonstrate
// LocalDateTime.now() method

import java.time.*;

public class GFG {
    public static void main(String[] args)
    {

        // create a clock
        ZoneId zid = ZoneId.of("Europe/Paris");

        // create an LocalDateTime object using now(zoneId)
        LocalDateTime lt
            = LocalDateTime.now(zid);

        // print result
        System.out.println("LocalDateTime : "
                           + lt);
    }
}

Output:

LocalDateTime : 2019-01-21T06:47:22.756

References:
https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#now()
https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#now(java.time.Clock)
https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#now(java.time.ZoneId)