Javascript : Calculate business days between two (2) dates, business days (Monday to Friday)

JS: Calc business days Monday to Friday

function calculateBusinessDays(startDate, endDate){
// Validate input
if (endDate < startDate)
    return 0;

// Calculate days between dates
var millisecondsPerDay = 86400 * 1000; // Day in milliseconds
startDate.setHours(0,0,0,1);  // Start just after midnight
endDate.setHours(23,59,59,999);  // End just before midnight
var diff = endDate - startDate;  // Milliseconds between datetime objects    
var days = Math.ceil(diff / millisecondsPerDay);

// Subtract two weekend days for every week in between
var weeks = Math.floor(days / 7);
days = days - (weeks * 2);

// Handle special cases
var startDay = startDate.getDay();
var endDay = endDate.getDay();

// Remove weekend not previously removed.   
if (startDay - endDay > 1)         
    days = days - 2;      

// Remove start day if span starts on Sunday but ends before Saturday
if (startDay == 0 && endDay != 6) {
    days = days - 1;  
}

// Remove end day if span ends on Saturday but starts after Sunday
if (endDay == 6 && startDay != 0) {
    days = days - 1;
}

return days;
}

Thank you, i would have to test it. Solution I provided is working as expected (I did autotests to validate that and using it in app iam building which relies on it heavily)

This would be great if you could have an option that deals with holidays as well...just saying...

there is one issue with this code if you enter following date
start date=april 10 2023
end date=april 17 2023
it returning 5 instead of 6
every monday is not counted if you can check