changes in Leap_Year algorithm (Bug fix)

datetime.c

@@ -9,9 +9,8 @@
 /********************************************************************************************************************/
 int isLeapYear (int year)                  
 {
-      if      (year % 400 == 0)      return  0 ;
-      else if (year % 100 == 0)      return -1 ; 
-      else if (year % 4 == 0)        return  0 ;
+    if ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0)) return -1;
+    else return 0;    
 }
 /******************************************************************************************/
 /* Check if the Year is Valid : in our case the input year should be between 1000 and 9999*/