Get dates of coming or passing Sundays, Mondays, Tuesdays, Wednesdays, Thursdays, Fridays, Saturdays
weekDay: choosen weekday, one of "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
startDate: date to count from, can be a string or Date object
period: (int) Number of months to count the dates to.
dateFormat: (int) 1 = YYYY-MM-DD 2 = YYYY/MM/DD 3 = YYYY Month DD
reverse: (boolean) to count for passing dates if set to true.