Returns if true a month ends mid week and false if not

Readme.md

Split Weeks

This code finds split weeks for a given year.

Usage

To use the code, define year as the year to find split weeks for. Then call the getMonthlyDates and isSplitWeek functions.

let year = new Date().getFullYear()
console.log(`Finding Split weeks for year ${year}`)

let lastDates = getMonthlyDates(new Date(year, 0, 31), 12);

lastDates.forEach(d => {
  console.log(`is split week:`, isSplitWeek(d));
});

The getMonthlyDates function takes a start date and a count and returns the last day of each month for the specified range, starting from the start date.

The isSplitWeek function takes a date and returns true or false, depending on if it is a split week or not.

Example

Using the code above, the output for 2020 would look like this:

Finding Split weeks for year 2020
Tue Dec 31 2019 00:00:00 GMT-0800 (Pacific Standard Time)
Week ends on Tuesday:
is split week: true 

Wed Jan 29 2020 00:00:00 GMT-0800 (Pacific Standard Time)

SplitWeekFinder.js

// Need to have current year
let year = new Date().getFullYear()
console.log(`Finding Split weeks for year ${year}`)

// For each month return last day of month for start to end date
function getMonthlyDates(start, count) {
  var result = [];
  var temp;
  var year = start.getFullYear();
  var month = start.getMonth();
  var startDay = start.getDate();
  for (var i = 0; i < count; i++) {
    temp = new Date(year, month + i, startDay);
    if (temp.getDate() != startDay) temp.setDate(0);
    result.push(temp);
  }
  return result;
}

// given end of month day return true if split week and false if not
function isSplitWeek(day) {
  const lastDayOfWeek = day.getDay();
  // Sunday - Saturday : 0 - 6
  daysOfWeek = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']

  console.log(`Week ends on ${daysOfWeek[lastDayOfWeek]}:`);
  switch(lastDayOfWeek){
    case 0:
      return false
    case 1:
      return true
    case 2:
      return true
    case 3:
      return true
    case 4:
      return true
    case 5:
      return false
    case 6:
      return false
  }
}

let lastDates = getMonthlyDates(new Date(year, 0, 31), 12);

lastDates.forEach(d => {
  console.log(d.toString())
  console.log(`is split week:`, isSplitWeek(d));
  console.log(' ')
})