Java Date and Time

In Java, working with date and time is mainly done using the classes from the java.time package (introduced in Java 8).
These classes are more powerful, accurate, and easier to use compared to older Date and Calendar classes.

✅ Import Required Package

Get Current Date

✔ Output

Get Current Time

Get Current Date and Time

Formatting Date and Time

Use DateTimeFormatter to format the output.

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;public class Main {
public static void main(String[] args) {
LocalDateTime now = LocalDateTime.now();DateTimeFormatter format = DateTimeFormatter.ofPattern("dd-MM-yyyy HH:mm:ss");

System.out.println("Formatted: " + now.format(format));
}
}

import java.time.LocalDateTime;

import java.time.format.DateTimeFormatter;public class Main {

public static void main(String[] args) {

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

System.out.println("Formatted: " + now.format(format));

}

✔ Output

Custom Date Creation

Comparing Dates

import java.time.LocalDate;

public class Main {
public static void main(String[] args) {
LocalDate today = LocalDate.now();
LocalDate future = today.plusDays(5);

System.out.println(today.isBefore(future)); // true
System.out.println(today.isAfter(future)); // false
}
}

import java.time.LocalDate;

public class Main {

public static void main(String[] args) {

LocalDate today = LocalDate.now();

LocalDate future = today.plusDays(5);

System.out.println(today.isBefore(future)); // true

System.out.println(today.isAfter(future)); // false

}

Adding or Subtracting Time

import java.time.LocalDate;

public class Main {
public static void main(String[] args) {
LocalDate today = LocalDate.now();

System.out.println("Next Week: " + today.plusWeeks(1));
System.out.println("Last Month: " + today.minusMonths(1));
}
}

import java.time.LocalDate;

public class Main {

public static void main(String[] args) {

LocalDate today = LocalDate.now();

System.out.println("Next Week: " + today.plusWeeks(1));

System.out.println("Last Month: " + today.minusMonths(1));

}

Working with Time Zones

import java.time.ZonedDateTime;
import java.time.ZoneId;public class Main {
public static void main(String[] args) {
ZonedDateTime time = ZonedDateTime.now(ZoneId.of("Asia/Kolkata"));
System.out.println("Time in India: " + time);
}
}

import java.time.ZonedDateTime;

import java.time.ZoneId;public class Main {

public static void main(String[] args) {

ZonedDateTime time = ZonedDateTime.now(ZoneId.of("Asia/Kolkata"));

System.out.println("Time in India: " + time);

}

Measure Time Duration

import java.time.Duration;
import java.time.LocalTime;public class Main {
public static void main(String[] args) {
LocalTime start = LocalTime.of(10, 00);
LocalTime end = LocalTime.of(12, 30);Duration d = Duration.between(start, end);

System.out.println("Minutes difference: " + d.toMinutes());
}
}

import java.time.Duration;

import java.time.LocalTime;public class Main {

public static void main(String[] args) {

LocalTime start = LocalTime.of(10, 00);

LocalTime end = LocalTime.of(12, 30);Duration d = Duration.between(start, end);

System.out.println("Minutes difference: " + d.toMinutes());

}

✔ Output

🏁 Summary

Feature	Example
Get current date	`LocalDate.now()`
Get current time	`LocalTime.now()`
Format date/time	`DateTimeFormatter`
Modify date/time	`.plus()`, `.minus()`
Compare	`.isBefore()`, `.isAfter()`
Time zones	`ZonedDateTime`

Java Date and Time