Usage of date.js causes errors

[saslanis]

trafficstars

If you use the date.js library export does not work because date.js parse method returns null while Date.parse returns NaN on wrong dates.

So just change line 345 from

return !/.*%/.test(v) && !isNaN(Date.parse(v));

to

return !/.*%/.test(v) && !(Date.parse(v) == null);

thanks for the tool