a=(this.day()+7-this.localeData()._week.dow)%7;return null==e?a:this.add(e-a,"d")},yt.isoWeekday=function(e){if(!this.isValid())return null!=e?this:NaN;if(null==e)return this.day()||7;var a,t,s=(a=e,t=this.localeData(),"string"==typeof a?t.weekdaysParse(a)%7||7:isNaN(a)?null:a);return this.day(this.day()%7?s:s-7)},yt.dayOfYear=function(e){var a=Math.round((this.clone().startOf("day")-this.clone().startOf("year"))/864e5)+1;return null==e?a:this.add(e-a,"d")},yt.hour=yt.hours=aa,yt.minute=yt.minutes=Mt,yt....