voslartomas

const getFirstMondayDate = (daysInMonth, startMonthIndex, firstDayOfTheYearIndex) => {
  const numberOfDaysUntillThisMonth = daysInMonth.reduce((acc, curr, i) => i < startMonthIndex ? acc + curr : acc)
  let firstDayDate = 1 // first day of the year - only for 1st month

  if (startMonthIndex > 0) {
    // get date of firstDayOfTheYearIndex of given month (for example - first day of the year is Sunday, we will get date for Sunday for given month)
    firstDayDate = 8 - (numberOfDaysUntillThisMonth - (startMonthIndex * 28))

voslartomas

### Keybase proof

I hereby claim:

  * I am voslartomas on github.
  * I am tvoslar (https://keybase.io/tvoslar) on keybase.
  * I have a public key ASCjl0hDHWChA77Hty0qAL6_btcodAvV_7dv0bBAcSyImgo

To claim this, I am signing this object:

voslartomas

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