从年中的周数获取日期范围

Posted 2021-02-27

function getDateRangeOfWeek(weekNo){
		var d1 = new Date();
		numOfdaysPastSinceLastMonday = eval(d1.getDay()- 1);
		d1.setDate(d1.getDate() - numOfdaysPastSinceLastMonday);
		var weekNoToday = d1.getWeek();
		var weeksInTheFuture = eval( weekNo - weekNoToday );
		d1.setDate(d1.getDate() + eval( 7 * weeksInTheFuture ));
		var rangeIsFrom =  eval(d1.getMonth()+1)   +"/"  +  d1.getDate()  + "/"  +   d1.getFullYear();
		d1.setDate(d1.getDate() + 6);		
		var rangeIsTo = eval(d1.getMonth()+1)   +"/"  +  d1.getDate()  + "/"  +   d1.getFullYear() ;
		return rangeIsFrom + " to "+rangeIsTo;
};