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<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script>
function f_leapyear(yy) //윤달 계산
{
if (yy%4==0 && yy%100!=0 || yy%400==0)
return 1;
else
return 0;
}
// Check how many days there are on the inputted year and month
// 년과 달을 입력하면, 한달에 몇일이 있는지 확인하는 함수입니다.
function f_dayofmonth(yy,mm)
{
switch (mm){
case 1: case 3: case 5: case 7: case 8: case 10: case 12:
return 31;
case 4: case 6: case 9: case 11:
return 30;
case 2:
return 28 + f_leapyear(yy);
}
}
function day_cal(yy, mm, dd){ //해당년도만의 일수 계산
var tot = 0;
for(var i=1;i<mm;i++){
tot += f_dayofmonth(yy,i);
}
return tot+dd;
}
function getDiffDay(val1, val2){ //날짜 일수 계산
var sdate_year = Number(val1.substr(0,4));
var sdate_month = Number(val1.substr(4,2));
var sdate_day = Number(val1.substr(6,2));
var edate_year = Number(val2.substr(0,4));
var edate_month = Number(val2.substr(4,2));
var edate_day = Number(val2.substr(6,2));
var year_result = edate_year-sdate_year;
var tot = 0;
for(i=sdate_year;i<edate_year+1;i++){
tot += f_leapyear(i);
}
tot += year_result*365; //년도 차이 일수 계산
tot += -day_cal(sdate_year, sdate_month, sdate_day)+1; //시작 날짜 일수 계산
tot += day_cal(edate_year, edate_month, edate_day); //종료 날짜 일수 계산
return tot;
}
</script>
</HEAD>
<BODY>
<script>
alert(getDiffDay('20090101', '20090228'));
</script>
</BODY>
</HTML>
