function getWeeksBetween2Dates(startDate, endDate) {
const millisecondsInAWeek = 1000 * 60 * 60 * 24 * 7;
return Math.round(Math.abs(endDate - startDate) / millisecondsInAWeek);
}
console.log(getWeeksBetween2Dates(new Date('2022-03-01'), new Date('2022-04-17')));
/*
run:
7
*/