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

		return this._domains.keys()
			.map(function(d) { return parseInt(d, 10); })
			.sort(function(a,b) { return a-b; });
	}
function() {
		"use strict";

		return this._domains.keys()
			.map(function(d) { return parseInt(d, 10); })
			.sort(function(a,b) { return a-b; });
	}
function ( ) { "use strict" ; return this . _domains . keys ( ) . map ( function ( d ) { return parseInt ( d , 10 ) ; } ) . sort ( function ( a , b ) { return a - b ; } ) ; }
Return the list of the calendar's domain timestamp

@return Array a sorted array of timestamp
Return the list of the calendar s domain timestamp