date/time types

[ThiefMaster]

Is there any special reason why only datetime is supported but not date (or time)? I think there are quite a few cases where one just needs date information but no time. And it would be cleaner to get a date object from a document than a datetime with useless time information.

[namlook]

Indeed, this would be nice feature. Feel free to make a pull request. And please, don't forget to add tests and update the doc :)

[ThiefMaster]

Due to the dealbreaker-type bug mentioned in #7 I have to consider using something else altogether... If you can provide a fix/workaround for that I'll be glad to submit a PR for this feature here!