<script language="JavaScript"><!--
function DatePosition(dateString,dateType) {
/*
function DatePosition
parameters: dateString dateType
returns: integer (-1, 0, 1)
dateString is a date passed as a string in the following
formats:
type 1 : 19970529
type 2 : 970529
type 3 : 29/05/1997
type 4 : 29/05/97
type 5 : 05/29/1997
type 6 : 05291997
type 7 : 052997
dateType is a numeric integer from 1 to 7, representing
the type of dateString passed, as defined above.
Returns -1 if the date passed is behind todays date
Returns 0 if the date passed is equal to todays date
or if dateType is not 1 to 7
Returns 1 if the date passed is ahead of todays date
Added Y2K checking. (Works for any century cross over)
*/
var now = new Date();
var today = new Date(now.getYear(),now.getMonth(),now.getDate());
var century = parseInt(now.getYear()/100)*100;
if (dateType == 1)
var date = new Date(dateString.substring(0,4),
dateString.substring(4,6)-1,
dateString.substring(6,8));
else if (dateType == 2)
{
if ((now.getYear()%100)>=parseInt(dateString.substring(0,2)))
{
var date = new Date(century+parseInt(dateString.substring(4,6)),
parseInt(dateString.substring(2,4)-1),
dateString.substring(4,6));
}
else
{
var date = new Date(century-100+parseInt(dateString.substring(0,2)),
parseInt(dateString.substring(2,4)-1),
dateString.substring(4,6));
}
}
else if (dateType == 3)
var date = new Date(dateString.substring(6,10),
dateString.substring(3,5)-1,
dateString.substring(0,2));
else if (dateType == 4)
{
if ((now.getYear()%100)>=parseInt(dateString.substring(6,8)))
{
document.write(century+parseInt(dateString.substring(6,8)),'<P>');
var date = new Date(century+parseInt(dateString.substring(4,6)),
parseInt(dateString.substring(3,5)-1),
dateString.substring(0,2));
}
else
{
document.write(century-100+parseInt(dateString.substring(6,8)),'<P>');
var date = new Date(century-100+parseInt(dateString.substring(4,6)),
parseInt(dateString.substring(3,5)-1),
dateString.substring(0,2));
}
}
else if (dateType == 5)
var date = new Date(dateString.substring(6,10),
dateString.substring(0,2)-1,
dateString.substring(3,5));
else if (dateType == 6)
var date = new Date(dateString.substring(4,8),
dateString.substring(0,2)-1,
dateString.substring(2,4));
else if (dateType == 7)
{
if ((now.getYear()%100)>=parseInt(dateString.substring(4,6)))
{
document.write('datestring Century:',century+parseInt(dateString.substring(4,6)),'<P>');
var date = new Date(century+parseInt(dateString.substring(4,6)),
parseInt(dateString.substring(0,2)-1),
dateString.substring(2,4));
}
else
{
document.write('datestring Century:',century-100+parseInt(dateString.substring(4,6)),'<P>');
var date = new Date(century-100+parseInt(dateString.substring(4,6)),
parseInt(dateString.substring(0,2)-1),
dateString.substring(2,4));
}
}
else
return false;
if (date < today)
{
document.write(date.toString(),' is behind ',today.toString(),'<P>');
return -1;
}
else if (date > today)
{
document.write(date.toString(),' is ahead of ',today.toString(),'<P>');
return 1;
}
else
{
document.write(date.toString(),' is the same as ',today.toString(),'<P>');
return 0;
}
}
//-->
</script>
<script language="JavaScript"><!--
document.writeln(DatePosition('041500',7));
//--></script>
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