NA_SD Download Doesn't Contain AirDate

[pkscout]

I noticed earlier this week that the NA_SD grabber doesn't output the AirDate. I figured out in the LUA code how to insert the OriginalAirDate into the Date field to get it to output, but I didn't see an obviously way to format the date properly. So I had to convert the date to string and then manipulate it into the correct format. Here's what I did, but if there is a better way to convert a date to a string with a particular format, it would probably be better to do it that way.