# Calculate number of weekdays between two dates in 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
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;
}


Start date and end date are exclusive, Only the days between given dates will be counted. Start date and end date will not be included.

Solution without loop:

static long days(Date start, Date end){
//Ignore argument check

Calendar c1 = Calendar.getInstance();
c1.setTime(start);
int w1 = c1.get(Calendar.DAY_OF_WEEK);

Calendar c2 = Calendar.getInstance();
c2.setTime(end);
int w2 = c2.get(Calendar.DAY_OF_WEEK);

//end Saturday to start Saturday
long days = (c2.getTimeInMillis()-c1.getTimeInMillis())/(1000*60*60*24);
long daysWithoutWeekendDays = days-(days*2/7);

// Adjust days to add on (w2) and days to subtract (w1) so that Saturday
// and Sunday are not included
if (w1 == Calendar.SUNDAY && w2 != Calendar.SATURDAY) {
w1 = Calendar.MONDAY;
} else if (w1 == Calendar.SATURDAY && w2 != Calendar.SUNDAY) {
w1 = Calendar.FRIDAY;
}

if (w2 == Calendar.SUNDAY) {
w2 = Calendar.MONDAY;
} else if (w2 == Calendar.SATURDAY) {
w2 = Calendar.FRIDAY;
}

return daysWithoutWeekendDays-w1+w2;
}