How to check date input.

Question

In a JText, I input a date valu, when i got the value ,i want to check if it's reasonable.
but idon't know how to check a number:
for example:
i input 31/31/2004,
you know it's not reasonable.
how to check it?

Answer 1

Here is a function that check for a valid date:
public boolean validDate(String strDatum)
boolean dane = true;
Calendar calendarDatum = Calendar.getInstance();
int godina = 0, mesec = 0, den = 0, najgolemDen = 0;
int i;
if(strDatum.length()<10)
dane = false;
else
for(i=0;i<2;i++)
if(!Character.isDigit(strDatum.charAt(i)))
dane = false;
for(i=3;i<5;i++)
if(!Character.isDigit(strDatum.charAt(i)))
dane = false;
for(i=6;i<10;i++)
if(!Character.isDigit(strDatum.charAt(i)))
dane = false;
if(dane)
godina = Integer.parseInt(strDatum.substring(6,10));
mesec = Integer.parseInt(strDatum.substring(3,5));
den = Integer.parseInt(strDatum.substring(0,2));
if(mesec>12||mesec<1)
dane = false;
else
calendarDatum.set(godina,mesec-1,1);
najgolemDen = calendarDatum.getActualMaximum(Calendar.DAY_OF_MONTH);
if(den>najgolemDen)
dane = false;
}//if(dane)
}//else (ako dolzinata e 10)
return dane;
}