How to Calculate the Number of Weekdays Between Two Dates in Java?

Calculate the Number of Weekdays Between Two Dates in Java

For those seeking a Java code snippet to calculate the number of business days (excluding weekends) between two dates, a popular response from 2011 proposed a solution utilizing the Calendar class. Despite Java 8's subsequent introduction of modern date-time handling capabilities through the java.time package, the following code demonstrates how to achieve this calculation using the Calendar API:

<code class="java">public static int getWorkingDaysBetweenTwoDates(Date startDate, Date endDate) {
    Calendar startCal = Calendar.getInstance();
    startCal.setTime(startDate);        
    
    Calendar endCal = Calendar.getInstance();
    endCal.setTime(endDate);

    int workDays = 0;

    //Return 0 if start and end are the same
    if (startCal.getTimeInMillis() == endCal.getTimeInMillis()) {
        return 0;
    }
    
    if (startCal.getTimeInMillis() > endCal.getTimeInMillis()) {
        startCal.setTime(endDate);
        endCal.setTime(startDate);
    }

    do {
       //excluding start date
        startCal.add(Calendar.DAY_OF_MONTH, 1);
        if (startCal.get(Calendar.DAY_OF_WEEK) != Calendar.SATURDAY && startCal.get(Calendar.DAY_OF_WEEK) != Calendar.SUNDAY) {
            ++workDays;
        }
    } while (startCal.getTimeInMillis() < endCal.getTimeInMillis()); //excluding end date

    return workDays;
}</code>

Note that this solution follows a "continuous" counting approach, excluding both the start and end dates themselves. For instance, if start and end are on a Monday and Friday, respectively, the method will return 4.

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