LocalDate LocalTime and LocalDateTime

The java.time Classes

Java 8 introduced java.time, replacing the old, error-prone Date and Calendar. All classes are immutable and thread-safe; methods like plusDays return a new object.

Class	Holds	Example value
`LocalDate`	date only	2024-08-15
`LocalTime`	time only	09:30
`LocalDateTime`	date + time, no zone	2024-08-15T09:30
`ZonedDateTime`	date + time + zone	2024-08-15T09:30+05:30[Asia/Kolkata]
`Instant`	a point on the UTC timeline	2024-08-15T04:00:00Z
`Period` / `Duration`	amount of time (days / seconds)	P1Y2M, PT2H30M

Note: In real code you get the current date with LocalDate.now(). The examples use fixed dates so the output is always the same.

Creating and Changing Dates

Example

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.Month;

public class Main {
    public static void main(String[] args) {
        LocalDate independence = LocalDate.of(2024, Month.AUGUST, 15);
        System.out.println("Date        : " + independence);
        System.out.println("Day of week : " + independence.getDayOfWeek());
        System.out.println("Day of year : " + independence.getDayOfYear());
        System.out.println("Leap year?  : " + independence.isLeapYear());

        LocalDate due = independence.plusDays(30).minusMonths(1).plusYears(1);
        System.out.println("Changed     : " + due);
        System.out.println("Original    : " + independence + " (unchanged, immutable)");

        LocalDate firstOfMonth = independence.withDayOfMonth(1);
        LocalDate lastOfMonth = independence.withDayOfMonth(independence.lengthOfMonth());
        System.out.println("Month range : " + firstOfMonth + " to " + lastOfMonth);
        System.out.println("Is Thursday?: " + (independence.getDayOfWeek() == DayOfWeek.THURSDAY));

        LocalTime opening = LocalTime.of(9, 30);
        System.out.println("Closes at   : " + opening.plusHours(12).plusMinutes(15));

        LocalDateTime meeting = LocalDateTime.of(2024, 8, 16, 14, 0);
        System.out.println("Meeting     : " + meeting);
        System.out.println("Before?     : " + meeting.isBefore(LocalDateTime.of(2024, 8, 16, 15, 0)));
    }
}

Output

Date        : 2024-08-15
Day of week : THURSDAY
Day of year : 228
Leap year?  : true
Changed     : 2025-08-14
Original    : 2024-08-15 (unchanged, immutable)
Month range : 2024-08-01 to 2024-08-31
Is Thursday?: true
Closes at   : 21:45
Meeting     : 2024-08-16T14:00
Before?     : true