src/cal-heatmap.js
function(d) {
		"use strict";

		if (this.options.weekStartOnMonday === false) {
			return d.getDay();
		}
		return d.getDay() === 0 ? 6 : (d.getDay()-1);
	}
function(d) {
		"use strict";

		if (this.options.weekStartOnMonday === false) {
			return d.getDay();
		}
		return d.getDay() === 0 ? 6 : (d.getDay()-1);
	}
function ( d ) { "use strict" ; if ( this . options . weekStartOnMonday === false ) { return d . getDay ( ) ; } return d . getDay ( ) === 0 ? 6 : ( d . getDay ( ) - 1 ) ; }
Get the weekday from a date

Return the week day number (0-6) of a date,
depending on whether the week start on monday or sunday

@param  Date d
@return int The week day number (0-6)
Get the weekday from a date