gets the number of the week by ISO (UTC time)
| date | Date | a date object |
| number | the number of the week |
var date1 = new Date(2013,11,12,8,35);
var result = webix.Date.getUTCISOWeek(date1);
console.log(result); // ->50
Actually, this is an alias to getISOWeek, we need two methods with different names for correct formatting processing.