Using date-range reprocessing of content doesn't pick up any items

I think a stringified date is being passed into the argument as opposed to millis since epoch of the dates:

![image](https://cloud.githubusercontent.com/assets/102265/3256901/91c22e26-f220-11e3-8679-8966436178d6.png)

That would likely be it.
`datepicker('getDate')` already returns a Date object. Just calling `getTime()` on it is sufficient. I'll follow up.