Format's JavaScript's Date's Day (returned as an integer)

format-day.js

function formatDay(day) {
	switch (day) {
		case 1:
		case '1':
			return 'Mon';
		case 2:
		case '2':
			return 'Tue';
		case 3:
		case '3':
			return 'Wed';
		case 4:
		case '4':
			return 'Thu';
		case 5:
		case '5':
			return 'Fri';
		case 6:
		case '6':
			return 'Sat';
		case 0:
		case '0':
			return 'Sun';
		default:
			return '';
	}
}