There is no numerical comparisson. So you need to write a regular expression matching your dates.
/^(201312|20140[12])/ would for example give you everything from 2013-12-01 to 2014-02-28 -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/tiddlywiki. For more options, visit https://groups.google.com/groups/opt_out.

