LESSON 13

3.1 Lesson Outcomes

After completing this lesson, learners will be able to:

• Define date and time handling in Java.
• Create and display date and time values.
• Use Java date and time classes.
• Format date and time values correctly.
• Perform basic date and time operations in Java applications.

3.2 Overview

Many software applications rely on date and time information for processing transactions, scheduling events, generating reports, and tracking activities. Java provides built-in classes for working with dates and time values.

This lesson introduces learners to Java date and time handling and explains how Java applications process date and time information. Learners will also explore date formatting and commonly used date and time operations.

Date and time functionality is commonly used in:

• banking systems,
• inventory systems,
• healthcare systems,
• booking systems,
• and enterprise applications.

Understanding date and time handling is important because most real-world applications process time-based data.

KT1301 — Introduction to Date and Time

Date and time handling refers to managing:

• dates,
• times,
• timestamps,
• and scheduling information

within Java applications.

Java provides built-in classes for processing date and time values.

Importance of Date and Time Handling

Date and time handling is important for:

• recording transactions,
• generating reports,
• scheduling activities,
• tracking events,
• and managing application logs.

KT1302 — The LocalDate Class

The LocalDate class stores date values without time information.

The LocalDate class belongs to the java.time package.

Importing LocalDate

import java.time.LocalDate;

Creating a Date

import java.time.LocalDate;

public class Main {

    public static void main(String[] args) {

        LocalDate today = LocalDate.now();

        System.out.println(today);
    }
}

Output

2026-05-08

Importance of LocalDate

LocalDate is used for:

• birthdays,
• appointments,
• report dates,
• and transaction dates.

KT1303 — The LocalTime Class

The LocalTime class stores time values without dates.

Example

import java.time.LocalTime;

public class Main {

    public static void main(String[] args) {

        LocalTime time = LocalTime.now();

        System.out.println(time);
    }
}

Output

14:30:15.123

Importance of LocalTime

LocalTime is commonly used for:

• schedules,
• operating hours,
• alarms,
• and system timing.

KT1304 — The LocalDateTime Class

The LocalDateTime class stores both date and time values together.

Example

import java.time.LocalDateTime;

public class Main {

    public static void main(String[] args) {

        LocalDateTime dateTime = LocalDateTime.now();

        System.out.println(dateTime);
    }
}

Output

2026-05-08T14:35:20.456

Importance of LocalDateTime

LocalDateTime is useful for:

• transaction records,
• audit systems,
• activity tracking,
• and event management.

KT1305 — Formatting Date and Time

Java allows developers to format date and time values for display.

The DateTimeFormatter class is used for formatting.

Example

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;

public class Main {

    public static void main(String[] args) {

        LocalDate today = LocalDate.now();

        DateTimeFormatter format =
                DateTimeFormatter.ofPattern("dd/MM/yyyy");

        System.out.println(today.format(format));
    }
}

Output

08/05/2026

Importance of Formatting

Formatting improves:

• readability,
• report presentation,
• and user experience.

KT1306 — Performing Date Operations

Java supports operations such as:

• adding days,
• subtracting months,
• and comparing dates.

Example

import java.time.LocalDate;

public class Main {

    public static void main(String[] args) {

        LocalDate today = LocalDate.now();

        LocalDate futureDate = today.plusDays(10);

        System.out.println(futureDate);
    }
}

Output

2026-05-18

Importance of Date Operations

Date operations help applications:

• calculate deadlines,
• manage schedules,
• process subscriptions,
• and track time periods.

KT1307 — Real-World Use of Date and Time

Date and time functionality is used in:

• banking systems,
• attendance systems,
• hospital systems,
• booking platforms,
• and enterprise applications.

Examples:

• transaction timestamps,
• appointment scheduling,
• payroll processing,
• and audit logging.

Date and time management is essential in modern software systems.

3.5 Key Notes / Summary

• Java provides built-in classes for handling date and time.
• LocalDate stores dates only.
• LocalTime stores time values only.
• LocalDateTime stores both date and time.
• DateTimeFormatter formats date and time values.
• Java supports date calculations and comparisons.
• Date and time handling is important in real-world applications.