CODEWITHSUNDEEP
javadatetimejodatimeintervalsdayofweek
Erind Pepi
Erind Pepi

Reputation: 25

Check if current date and time falls within a date range excluding weekends

I am writing a project which handles card reading for door passing. The system must check if the swiped card has permission to a specific door at that specific time. For example, some cards do not have permission during weekends or outside working hours which are 8-20. How do I program such a thing with Joda-Time?

Right now I have:

//The code below that I have only checks for within a given date and time range.
DateTime start = new DateTime(2012, 1, 1, 0, 0);
DateTime end = new DateTime(2012, 12, 31, 0, 0);
Interval interval = new Interval(start, end);
boolean DateTimeCheck3 = interval.contains(time); // time is predeclared and gets current time from another class

Upvotes: 2

Views: 1328

Answers (2)

Arvind Kumar Avinash
Arvind Kumar Avinash

Reputation: 79085

java.time

In March 2014, Java 8 introduced the modern, java.time date-time API which supplanted the error-prone legacy, java.util date-time API. Also, shown below is a notice on the Joda-Time Home Page:

Note that from Java SE 8 onwards, users are asked to migrate to java.time (JSR-310) - a core part of the JDK which replaces this project.

LocalDateTime#getDayOfWeek returns you an enum constant for a given LocalDateTime which you can use for your comparison. The advantage of representing the days of a week by enum constants rather than a number is that you no longer need to remember whether they start from 0 or 1.

Demo:

public class Main {
    public static void main(String[] args) {
        // A sample date-time corresponding to `time` in code of your question.
        // ZoneId.systemDefault() gives you the ZoneId set to the JVM executing the code
        // Replace it as per your requirement e.g. ZoneId.of("Europe/Stockholm").
        LocalDateTime ldt = LocalDateTime.now(ZoneId.systemDefault());

        DayOfWeek dow = ldt.getDayOfWeek();
        LocalTime time = ldt.toLocalTime();

        if (dow == DayOfWeek.SATURDAY
                || dow == DayOfWeek.SUNDAY
                || time.isBefore(LocalTime.of(8, 0))
                || time.isAfter(LocalTime.of(20, 0))) {
            System.out.println("Not allowed");
            // Rest of the processing
        } else {
            System.out.println("Allowed");
            // Rest of the processing
        }
    }
}

Online Demo

Note: As mentioned in this comment, LocalDateTime.now() will give you the date-time in your JVM's time zone. For date-time in a specific time zone, pass an explicit time zone e.g., LocalDateTime.now(ZoneId.of("Europe/Stockholm")). One should consider using the richer ZonedDateTime instead of LocalDateTime.

Learn more about the modern Date-Time API from Trail: Date Time.

Upvotes: 2

Hiery Nomus
Hiery Nomus

Reputation: 17769

Using 1 <= time.getDayOfWeek() && time.getDayOfWeek() <= 5 You can ensure that the day of the week is between Monday 1 and Friday 5.

Upvotes: 2

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