JavaScript Code

Count the number of working days in a month

function numberOfWorkingDays(month, year) { 
  let counter = 0; 
  let date = new Date(year, month - 1, 1); 
  const endDate = new Date(date.getFullYear(), date.getMonth() + 1, 0); 

  while (date.getTime() < endDate.getTime()) { 
    const weekDay = date.getDay(); 
    if (weekDay !== 0 && weekDay !== 6) { 
      counter += 1; 
    } 
    date = new Date(date.getFullYear(), date.getMonth(), date.getDate() + 1); 
  } 
  return counter; 
} 

Calculate the number of days between two dates

function numberOfDays(start, end) { 
  const startDate = new Date(start); 
  const endDate = new Date(end); 
  return Math.abs((startDate.getTime() - endDate.getTime()) / (1000 * 60 * 60 * 24)); 
}