current month's events displaying in next month

I have configure there scheduler.config.server_utc = true; but still current month’s events are displaying in next month. For example, event of 2015-12-11(YY-MM-DD) is displaying in January,2016 instead of Dec of 2015

if you create dates from code, e.g. var startDate = new Date(2015, 12, 11);
then note that the months are zero-based, 0 goes for January and 11 for December … e/getMonth