When i call this line directly:

var lastUpdated = $.fn.fmatter('date', udata.lastUpdated, { newformat: 'M d Y h:iA' });

newformat doesn't work. It always return format in d/m/y. I tried to debug:

$.fn.fmatter.date = function (cellval, opts, rwd, act) {

...

//return  $.fmatter.util.DateFormat(op.srcformat,cellval,op.newformat,op); //replaced this line with the one below

return  $.fmatter.util.DateFormat(op.srcformat,cellval,opts.newformat,op);

...

}

After replacing it works fine. I'm not sure if this is a bug.