function isvalidyear(psyear)
{
var syear = new string(psyear);
if(psyear==null)
{
return false;
}
if(isnan(psyear)==true)
{
return false;
}
if(syear == "")
{
return true;
}
if(syear.match(/[^0-9]/g)!=null)
{
return false;
}
var nyear = parseint(syear, 10);
if((nyear < 0) || (9999 < nyear))
{
return false;
}
return true;
}
function isvalidmonth(psmonth)
{
var smonth = new string(psmonth);
if(psmonth==null)
{
return false;
}
if(isnan(psmonth)==true)
{
return false;
}
if(smonth == "")
{
return true;
}
if(smonth.match(/[^0-9]/g)!=null)
{
return false;
}
var nmonth = parseint(smonth,10);
if((nmonth < 0) || (12 < nmonth))
{
return false;
}
return true;
}
function isvalidday(psday)
{
var sday = new string(psday);
if(psday==null)
{
return false;
}
if(isnan(psday)==true)
{
return false;
}
if(sday == "")
{
return true;
}
if(sday.match(/[^0-9]/g)!=null)
{
return false;
}
var nday = parseint(psday, 10);
if((nday < 0) || (31 < nday))
{
return false;
}
return true;
}
function isvaliddate(psyear, psmonth, psday)
{
if(psyear==null || psmonth==null || psday==null)
{
return false;
}
var syear = new string(psyear);
var smonth = new string(psmonth);
var sday = new string(psday);
if(isvalidyear(syear)==false)
{
return false;
}
if(isvalidmonth(smonth)==false)
{
return false;
}
if(isvalidday(sday)==false)
{
return false;
}
var nyear = parseint(syear, 10);
var nmonth = parseint(smonth, 10);
var nday = parseint(sday, 10);
if(syear=="" && smonth=="" && sday=="")
{
return true;
}
if(syear=="" || smonth=="" || sday=="")
{
return false;
}
if(nmonth < 1 || 12 < nmonth)
{
return false;
}
if(nday < 1 || 31 < nday)
{
return false;
}
if(nmonth == 2)
{
if((nyear % 400 == 0) || (nyear % 4 == 0) && (nyear % 100 != 0))
{
if((nday < 1) || (nday > 29))
{
return false;
}
}
else
{
if((nday < 1) || (nday > 28))
{
return false;
}
}
}
else if((nmonth == 1) ||
(nmonth == 3) ||
(nmonth == 5) ||
(nmonth == 7) ||
(nmonth == 8) ||
(nmonth == 10) ||
(nmonth == 12))
{
if((nday < 1) || (31 < nday))
{
return false;
}
}
else
{
if((nday < 1) || (30 < nday))
{
return false;
}
}
return true;
}
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