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Forms >>> True Date Selector.

This script helps to insure the integrity of the date entered in drop-down menus. Dates, such as Feb 31st can't be selected. Today's date is automatically selected.

Add the below code to the <body> section of your page:

<script language="javascript" type="text/javascript">
/* Visit http://www.yaldex.com/ for full source code
and get more free JavaScript, CSS and DHTML scripts! */
<!-- Begin
//set todays date
Now = new Date();
NowDay = Now.getDate();
NowMonth = Now.getMonth();
NowYear = Now.getYear();
if (NowYear < 2000) NowYear += 1900; //for Netscape

//function for returning how many days there are in a month including leap years
function DaysInMonth(WhichMonth, WhichYear)
{
  var DaysInMonth = 31;
  if (WhichMonth == "Apr" || WhichMonth == "Jun" || WhichMonth == "Sep" || WhichMonth == "Nov") DaysInMonth = 30;
  if (WhichMonth == "Feb" && (WhichYear/4) != Math.floor(WhichYear/4)) DaysInMonth = 28;
  if (WhichMonth == "Feb" && (WhichYear/4) == Math.floor(WhichYear/4)) DaysInMonth = 29;
  return DaysInMonth;
}

//function to change the available days in a months
function ChangeOptionDays(Which)
{
  DaysObject = eval("document.Form1." + Which + "Day");
  MonthObject = eval("document.Form1." + Which + "Month");
  YearObject = eval("document.Form1." + Which + "Year");

  Month = MonthObject[MonthObject.selectedIndex].text;
  Year = YearObject[YearObject.selectedIndex].text;

  DaysForThisSelection = DaysInMonth(Month, Year);
//  DaysObject.options.length=DaysForThisSelection;
  CurrentDaysInSelection = DaysObject.length;
  if (CurrentDaysInSelection > DaysForThisSelection)
  {
    for (i=0; i<(CurrentDaysInSelection-DaysForThisSelection); i++)
    {
      DaysObject.options[DaysObject.options.length - 1] = null
    }
  }
  if (DaysForThisSelection > CurrentDaysInSelection)
  {
    for (i=0; i<(DaysForThisSelection-CurrentDaysInSelection); i++)
    {
      NewOption = new Option(DaysObject.options.length + 1);
//      DaysObject.add(NewOption);// Only IE
      DaysObject.options[DaysObject.options.length] = NewOption;
    }
  }
    if (DaysObject.selectedIndex < 0) DaysObject.selectedIndex == 0;
}

//function to set options to today
function SetToToday(Which)
{
  DaysObject = eval("document.Form1." + Which + "Day");
  MonthObject = eval("document.Form1." + Which + "Month");
  YearObject = eval("document.Form1." + Which + "Year");

  YearObject[0].selected = true;
  MonthObject[NowMonth].selected = true;

  ChangeOptionDays(Which);

  DaysObject[NowDay-1].selected = true;
}

//function to write option years plus x
function WriteYearOptions(YearsAhead)
{
  line = "";
  for (i=0; i<YearsAhead; i++)
  {
    line += "<OPTION>";
    line += NowYear + i;
  }
  return line;
}
function Go()
{
    SetToToday('FirstSelect');
}
window.onload=Go;
//  End -->
</script>
<nobr>
<FORM name="Form1">
<SELECT
name="FirstSelectDay">
<OPTION>1
<OPTION>2
<OPTION>3
<OPTION>4
<OPTION>5
<OPTION>6
<OPTION>7
<OPTION>8
<OPTION>9
<OPTION>10
<OPTION>11
<OPTION>12
<OPTION>13
<OPTION>14
<OPTION>15
<OPTION>16
<OPTION>17
<OPTION>18
<OPTION>19
<OPTION>20
<OPTION>21
<OPTION>22
<OPTION>23
<OPTION>24
<OPTION>25
<OPTION>26
<OPTION>27
<OPTION>28
<OPTION>29
<OPTION>30
<OPTION>31
</SELECT>
<SELECT
name="FirstSelectMonth" onChange="ChangeOptionDays('FirstSelect')">
<OPTION>Jan
<OPTION>Feb
<OPTION>Mar
<OPTION>Apr
<OPTION>May
<OPTION>Jun
<OPTION>Jul
<OPTION>Aug
<OPTION>Sep
<OPTION>Oct
<OPTION>Nov
<OPTION>Dec
</SELECT>
<SELECT
name="FirstSelectYear" onChange="ChangeOptionDays('FirstSelect')">
<SCRIPT language="JavaScript">
document.write(WriteYearOptions(50));
</SCRIPT>
</SELECT>
</FORM>
</nobr>

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