Field Format in dbgrid is yyyy/MM/dd
function reconfigure(sender, store, columns, oldStore, oldColumns, eOpts)
{
columns[x].renderer = function(v) {
if (v) {
var jd;
jd = new Date(v);
y = Ext.Date.getJalaliFullYear(jd) + '/';
m = Ext.String.leftPad(Ext.Date.getjalaliMonth(jd) + 1, 2, '0') + '/' +
d = Ext.String.leftPad(Ext.Date.getjalaliDate(jd), 2, '0');
return y + m + d;
}
};
}