LocalTime and LocalDateTime

Learn time with LocalTime and LocalDateTime.

LocalTime and LocalDateTime

LocalTime holds a time of day: hour, minute, second. LocalDateTime combines date and time into a single object. Both are immutable.

Example: LocalTime t = LocalTime.of(10, 30); and LocalDateTime dt = LocalDateTime.of(2024, 1, 15, 10, 30);. Methods like plusHours and minusMinutes again return new objects. Use LocalDateTime when both date and time are needed together.

Operating on time values

The plus and minus methods also work on LocalTime and LocalDateTime. For hours you use plusHours, for minutes plusMinutes.

Example: dt.plusHours(2).minusMinutes(15). This adds 2 hours and subtracts 15 minutes. The result is again a new object. Time math is handy for finding when a meeting ends; it handles the 24-hour boundary automatically.

Exercise Add two hours to a datetime

Create a datetime with LocalDateTime.of(2024, 1, 15, 10, 30). Add two hours with plusHours(2) and print the result with System.out.println.

Show example solution

import java.time.LocalDateTime;

public class DateTimePlus {
    public static void main(String[] args) {
        LocalDateTime dt = LocalDateTime.of(2024, 1, 15, 10, 30);
        System.out.println(dt.plusHours(2));
    }
}

Test yourself

Match the time classes

LocalTime

Time
LocalDateTime

Date and time
LocalTime.now

Current time
of

Specific value
Which class holds both date and time in one object?
- LocalDate
- LocalTime
- Period
- LocalDateTime
Show answer

LocalDateTime — LocalDateTime combines date and time.

Complete the LocalTime.of call

LocalTime t = LocalTime.____(10, 30);

Show answer

LocalTime t = LocalTime.of(10, 30);

Next lesson: Duration and Period

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