internal static string InvGetMonth(int month)
{
switch(month)
{
case 1 : return "Jan";
case 2 : return "Feb";
case 3 : return "Mar";
case 4 : return "Apr";
case 5 : return "May";
case 6 : return "Jun";
case 7 : return "Jul";
case 8 : return "Aug";
case 9 : return "Sep";
case 10 : return "Oct";
case 11 : return "Nov";
case 12 : return "Dec";
default : return "???";
}
}
public static void ParseHeader(ref Header header)