New Date -Time API in Java 8

New Date -Time API in Java 8

Java 8 introduced a new Date and Time API under the package java.time to overcome the limitations of the old java.util.Date and java.util.Calendar classes. Previously it was challenging to work with date and time in the Java project. The old APIs had several issues. To overcome this, The new java.time API was introduced in Java 8 to solves these by being immutable, type-safe, and comprehensive.

Why a New Date-Time API?

1. Not thread-safe → objects could be modified, causing concurrency problems.
2. Confusing design → Mixed handling of date, time, and time zones.
3. Limited functionality → Few operations for manipulating dates and times.
4. Poor readability → Months were zero-based, leading to errors.

Key Benefits:

1. Immutable & thread-safe → Safe for concurrent use.
2. Clear separation of date, time, and time zone.
3. Rich API for calculations (add/subtract days, months, etc.).
4. Better formatting/parsing with .
5. Interoperability with legacy via conversion methods.

Core Classes in Java Time API:

1. Local API - Represent date/time without time zone.
2. Zoned API - Handle time zones and offsets.
3. Instant - Represents a timestamp (machine time).
4. Period/Duration - Represent date-based (years, months, days) and time-based (hours, minutes, seconds) amounts.
5. Temporal Units - Type-safe units like DAYS, WEEKS, YEARS.
6. Formatter - Parsing and formatting dates/times.

For Example:

import java.time.*;

public class DateTimeDemo {

public static void main(String[] args) {

// Current date and time

LocalDate date = LocalDate.now();

LocalTime time = LocalTime.now();

LocalDateTime dateTime = LocalDateTime.now();

// Specific date

LocalDate independenceDay = LocalDate.of(1947, Month.AUGUST, 15);

// Adding days

LocalDate nextWeek = date.plusWeeks(1);

// Working with time zones

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

// Duration between two times

Duration duration = Duration.between(time, time.plusHours(2));

System.out.println("Today: " + date);

System.out.println("Independence Day: " + independenceDay);

System.out.println("Next Week: " + nextWeek);

System.out.println("Zoned Time: " + zoned);

System.out.println("Duration: " + duration);

}

}

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