오늘 기준 이전, 이후 날짜 구하기

리턴되는 날짜형식 : YYYY-MM-DD

$.extend({

getDateAdd: function(number, dateType){

var today = new Date();

var dateAdd = "";

number = parseInt(number);

switch (dateType){

case "Y" :

dateAdd = new Date(today.setYear(today.getFullYear() + number));

break;

case "M" :

dateAdd = new Date(today.setMonth(today.getMonth() + number));

break;

case "D" :

dateAdd = new Date(today.setDate(today.getDate() + number));

break;

}

return dateAdd.getFullYear() + "-" + $.addZero(dateAdd.getMonth() + 1) + "-" + $.addZero(dateAdd.getDate());

},

addZero: function(number){

return parseInt(number, 10) < 10 ? "0" + number : number;

}

});

alert($.getDateAdd(1, "Y"))

alert($.getDateAdd(5, "M"));

alert($.getDateAdd("-1", "D"));