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This unique calendar, constructed using a textarea, enables you to look up the calendar for any month of any year! Use the drop-down JavaScript menu to select the desired month. Quite exceptional.

Label: Any-Month calendar script

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<SCRIPT language=JavaScript>
// Any-Month calendar script- Rob Patrick (rpatrick@mit.edu)

function setToday() {
var now   = new Date();
var day   = now.getDate();
var month = now.getMonth();
var year  = now.getYear();
if (year < 2000)    // Y2K Fix, Isaac Powell
year = year + 1900; // http://onyx.idbsu.edu/~ipowell
this.focusDay = day;
document.calControl.month.selectedIndex = month;
document.calControl.year.value = year;
displayCalendar(month, year);
}
function isFourDigitYear(year) {
if (year.length != 4) {
alert ("Sorry, the year must be four-digits in length.");
document.calControl.year.select();
document.calControl.year.focus();
} else { return true; }
}
function selectDate() {
var year  = document.calControl.year.value;
if (isFourDigitYear(year)) {
var day   = 0;
var month = document.calControl.month.selectedIndex;
displayCalendar(month, year);
    }
}

function setPreviousYear() {
var year  = document.calControl.year.value;
if (isFourDigitYear(year)) {
var day   = 0;
var month = document.calControl.month.selectedIndex;
year--;
document.calControl.year.value = year;
displayCalendar(month, year);
   }
}
function setPreviousMonth() {
var year  = document.calControl.year.value;
if (isFourDigitYear(year)) {
var day   = 0;
var month = document.calControl.month.selectedIndex;
if (month == 0) {
month = 11;
if (year > 1000) {
year--;
document.calControl.year.value = year;
}
} else { month--; }
document.calControl.month.selectedIndex = month;
displayCalendar(month, year);
   }
}
function setNextMonth() {
var year  = document.calControl.year.value;
if (isFourDigitYear(year)) {
var day   = 0;
var month = document.calControl.month.selectedIndex;
if (month == 11) {
month = 0;
year++;
document.calControl.year.value = year;
} else { month++; }
document.calControl.month.selectedIndex = month;
displayCalendar(month, year);
   }
}
function setNextYear() {
var year = document.calControl.year.value;
if (isFourDigitYear(year)) {
var day = 0;
var month = document.calControl.month.selectedIndex;
year++;
document.calControl.year.value = year;
displayCalendar(month, year);
   }
}
function displayCalendar(month, year) {       
month = parseInt(month);
year = parseInt(year);
var i = 0;
var days = getDaysInMonth(month+1,year);
var firstOfMonth = new Date (year, month, 1);
var startingPos = firstOfMonth.getDay();
days += startingPos;
document.calButtons.calPage.value  =   " Su Mo Tu We Th Fr Sa";
document.calButtons.calPage.value += "\n --------------------";
for (i = 0; i < startingPos; i++) {
if ( i%7 == 0 ) document.calButtons.calPage.value += "\n ";
document.calButtons.calPage.value += "   ";
}
for (i = startingPos; i < days; i++) {
if ( i%7 == 0 ) document.calButtons.calPage.value += "\n ";
if (i-startingPos+1 < 10)
document.calButtons.calPage.value += "0";
document.calButtons.calPage.value += i-startingPos+1;
document.calButtons.calPage.value += " ";
}
for (i=days; i<42; i++)  {
if ( i%7 == 0 ) document.calButtons.calPage.value += "\n ";
document.calButtons.calPage.value += "   ";
}
document.calControl.Go.focus();
}
function getDaysInMonth(month,year)  {
var days;
if (month==1 || month==3 || month==5 || month==7 || month==8 || month==10 || month==12)  days=31;
else if (month==4 || month==6 || month==9 || month==11) days=30;
else if (month==2)  {
if (isLeapYear(year)) { days=29; }
else { days=28; }
}
return (days);
}
function isLeapYear (Year) {
if (((Year % 4)==0) && ((Year % 100)!=0) || ((Year % 400)==0)) {
return (true);
} else { return (false); }
}
// End -->
</SCRIPT>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

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<BODY onload=setToday()>
<FORM name=calControl onsubmit="return false;">
<TABLE cellSpacing=0 cellPadding=0 border=0>
  <TBODY>
  <TR>
    <TD colSpan=7><SELECT onchange=selectDate() name=month> <OPTION 
        selected>January<OPTION>February<OPTION>March<OPTION>April<OPTION>May<OPTION>June<OPTION>July<OPTION>August<OPTION>September<OPTION>October<OPTION>November<OPTION>December</OPTION></SELECT> 
      <INPUT maxLength=4 size=4 name=year> <INPUT onclick=selectDate() type=button value=Build! name=Go> 

</TD></TR></FORM>
  <FORM name=calButtons>
  <TR>
    <TD><TEXTAREA name=calPage rows=8 wrap=no cols=24 FONT="Courier"></TEXTAREA></TD>
  <TR>
    <TD><INPUT onclick=setPreviousYear() type=button value=" <<  " name=previousYear> 
<INPUT onclick=setPreviousMonth() type=button value="  <  " name=previousYear> 
<INPUT onclick=setToday() type=button value=Today name=previousYear> <INPUT onclick=setNextMonth() type=button value="  >  " name=previousYear> 
<INPUT onclick=setNextYear() type=button value="  >> " name=previousYear> 
    </TD></TR></TBODY></TABLE></FORM></FONT>
</BODY>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->