⏰ Java Date & Time API (java.time)

? Quick Overview

The Java Date and Time API (java.time) was introduced in Java 8 to fix the problems of older classes like Date and Calendar. It is immutable, thread-safe, and much easier to understand and use.

? Key Concepts

• LocalDate — date without time
• LocalTime — time without date
• LocalDateTime — date and time
• ZonedDateTime — date and time with timezone
• Period & Duration — date/time differences

? Syntax / Theory

All modern date and time classes are available inside the java.time package. These classes are immutable, meaning once created, their values cannot be changed. Any modification returns a new object.

? Code Examples

// Creating and displaying current date
import java.time.LocalDate;

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

// Working with date and time together
import java.time.LocalDateTime;

public class Main {
public static void main(String[] args) {
LocalDateTime now = LocalDateTime.now();
System.out.println(now);
}
}

? Live Output / Explanation