<head>
<script language="JavaScript">
<!-- for sucky browsers
Months = new Array(12);
Months[0] = "January";
Months[1] = "February";
Months[2] = "March";
Months[3] = "April";
Months[4] = "May";
Months[5] = "June";
Months[6] = "July";
Months[7] = "August";
Months[8] = "September";
Months[9] = "October";
Months[10] = "November";
Months[11] = "December";
function PadSpaces(TheString)
{
var Spaces = " ";
len = Math.round((9 - TheString.length)/2);
return Spaces.substring(0,len) + TheString;
}
function NumLeapYears(StartYear, EndYear)
{
var LeapYears, i;
if (EndYear >= StartYear){
for(LeapYears = 0; StartYear <= EndYear; StartYear++)
if (IsLeapYear(StartYear)) LeapYears++;
}else{
for(LeapYears = 0; EndYear <= StartYear; EndYear++)
if (IsLeapYear(EndYear)) LeapYears++;
}
return LeapYears;
}
function IsLeapYear(Year)
{
if(Math.round(Year/4) == Year/4){
if(Math.round(Year/100) == Year/100){
if(Math.round(Year/400) == Year/400)
return true;
else return false;
}else return true;
}
return false;
}
function Trim(TheString)
{
var len;
len = TheString.length;
while(TheString.substring(0,1) == " "){ //trim left
TheString = TheString.substring(1, len);
len = TheString.length;
}
while(TheString.substring(len-1, len) == " "){ //trim right
TheString = TheString.substring(0, len-1);
len = TheString.length;
}
return TheString;
}
function DetermineMonthIdx()
{
var i, month, month_s, len;
month = Trim(document.calform.elements[4].value);
len = month.length;
for( i = 0; i <12; i++){
month_s = Months[i].substring(0,len);
if (month_s.toUpperCase() == month.toUpperCase())
return (i);
}
return -1;
}
function FindNewYearStartingDay(Year)
{
var LeapYears, Years, Day;
LeapYears = NumLeapYears(1995, Year);
if (Year >=1995)
Years = (Year -1995)+LeapYears;
else Years = (Year -1995)-LeapYears;
if (Year >=1995)
Day = Math.round(((Years/7 - Math.floor(Years/7))*7)+.1);
else Day = Math.round(((Years/7 - Math.ceil(Years/7))*7)-.1);
if (Year >=1995){
if(IsLeapYear(Year)) Day--;
}else Day += 7;
if(Day < 0) Day = 6;
if(Day > 6) Day = 0;
return Day;
}
function FindNumDaysInMonth(Year, Month)
{
if(Month == 1){
if(IsLeapYear(Year)) return 29;
else return 28;
}else{
if(Month >6) Month++;
if(Month/2 == Math.round(Month/2)) return 31;
}
return 30;
}
function FindMonthStartDay(NewYearDay, Year, Month)
{
var MonthStartDay;
AddArray = new Array(12);
AddArray[0]=0;AddArray[1]=3;AddArray[2]=3;AddArray[3]=6;
AddArray[4]=1;AddArray[5]=4;AddArray[6]=6;AddArray[7]=2;
AddArray[8]=5;AddArray[9]=0;AddArray[10]=3;AddArray[11]=5;
MonthStartDay = NewYearDay + AddArray[Month];
if(IsLeapYear(Year) && (Month ) > 1) MonthStartDay ++;
if (MonthStartDay > 6) MonthStartDay -= 7;
return MonthStartDay;
}
function FillCalendar()
{
var Year, Month, Midx, NewYearDay, MonthStartDay;
var NumDaysInMonth, i, t;
Year = parseFloat(document.calform.elements[1].value);
Month = document.calform.elements[4].value;
Midx = DetermineMonthIdx();
if (Midx == -1){
alert ("Can't recognize that month");
return;
}
NewYearDay = FindNewYearStartingDay(Year);
MonthStartDay = FindMonthStartDay(NewYearDay, Year, Midx);
NumDaysInMonth = FindNumDaysInMonth(Year, Midx);
for(i = 6; i < 43; i++){
t = i-5-MonthStartDay;
if ( t >= 1 && t <= NumDaysInMonth)
document.calform.elements[i].value =t;
else document.calform.elements[i].value = "";
}
}
function IncDecYear(val)
{
var valNum = parseInt(val);
var valNum2 = parseInt(document.calform.elements[1].value)
document.calform.elements[1].value = valNum2 + valNum;
FillCalendar()
}
function IncDecMonth(val)
{
var valNum = parseInt(val);
var Midx = DetermineMonthIdx();
Midx += valNum;
if(Midx > 11) Midx = 0;
if(Midx < 0) Midx = 11;
document.calform.elements[4].value = PadSpaces(Months[Midx]);
FillCalendar()
}
// -->
</script>
</head>