java.time.LocalDateTime represents a date and time without a time zone. It is a combination of LocalDate and LocalTime.
Commonly Used Methods
Simple Program
import java.time.LocalDateTime;
public class SimpleLocalDateTimeExample {
public static void main(String[] args) {
LocalDateTime now = LocalDateTime.now();
LocalDateTime deadline = LocalDateTime.of(2025, 7, 20, 18, 0);
System.out.println("Current date and time: " + now);
System.out.println("Submission deadline: " + deadline);
System.out.println("Is deadline after now? " + deadline.isAfter(now));
}
}Problem Statement
LotusJavaPrince and Mahesh are building a meeting reminder system for employees. Each reminder must be scheduled precisely with date and time. The system should:
- Take input for meeting date and time.
- Validate that the meeting is not in the past.
- If valid, schedule the meeting.
- If invalid, display a warning.
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Scanner;
public class MeetingReminderSystem {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
// Current date-time
LocalDateTime currentDateTime = LocalDateTime.now();
// Input date-time
System.out.print("Enter meeting date and time (yyyy-MM-dd HH:mm): ");
String input = scanner.nextLine();
try {
LocalDateTime meetingTime = LocalDateTime.parse(input, formatter);
System.out.println("Current time: " + currentDateTime.format(formatter));
System.out.println("Requested meeting time: " + meetingTime.format(formatter));
if (meetingTime.isBefore(currentDateTime)) {
System.out.println("Error: Cannot schedule a meeting in the past.");
} else {
System.out.println("Meeting scheduled successfully.");
}
} catch (Exception e) {
System.out.println("Invalid format. Please enter in 'yyyy-MM-dd HH:mm' format.");
}
scanner.close();
}
}
/*
Enter meeting date and time (yyyy-MM-dd HH:mm): 2025-05-22 14:30
Current time: 2025-05-22 11:45
Requested meeting time: 2025-05-22 14:30
Meeting scheduled successfully.
*/The LocalDateTime class is a powerful tool when you need both date and time together, such as:
- Scheduling events
- Logging timestamps
- Creating calendar applications
- Managing time-sensitive records
However, it does not include time-zone information, making it unsuitable for representing exact moments in a global context. Use ZonedDateTime if time zone matters.
LocalDateTime offers seamless integration with DateTimeFormatter, LocalDate, and LocalTime, making it ideal for most business-level scheduling and recordkeeping needs.