filter by date values:

equality with granularities:

* `2012-07-17 13:11`
* `2012-07-17 13`
* `2012-07-17`
* `2012-07`
* `2012`

less than:

* `< 2012-07-17`

greater than:

* `> 1980`

ranges:

* `1900 -> 2000`

support for regular expressions, enter by pasting `/REGEXP/`