Get week number of month from Date

People struggle a lot when it needs to get a week from a date, here below is a simple example to get the week number of the month from a Date.

function getWeekOfMonth(date) { let adjustedDate = date.getDate()+date.getDay(); let prefixes = ['1', '2', '3', '4', '5','6']; return (parseInt(prefixes[0 | adjustedDate / 7])+1); }