a=Ce(this,1,4).week;return null==e?a:this.add(7*(e-a),"d")},yt.weeksInYear=function(){var e=this.localeData()._week;return Ie(this.year(),e.dow,e.doy)},yt.weeksInWeekYear=function(){var e=this.localeData()._week;return Ie(this.weekYear(),e.dow,e.doy)},yt.isoWeeksInYear=function(){return Ie(this.year(),1,4)},yt.isoWeeksInISOWeekYear=function(){return Ie(this.isoWeekYear(),1,4)},yt.date=lt,yt.day=yt.days=function(e){if(!this.isValid())return null!=e?this:NaN;var a,t,s=this._isUTC?this._d.getUTCDay():this._d.getDay();return...