[Krename-users] use date only from exif datetime

[todd r. <tod...@gm...>]

I have a bunch of pictures that I want to move to folders based on the
date they were taken.  These pictures all have exif datetime fields,
which list the date in the format "YYYY:MM:DD HH:MM:SS".  However, I
want to put them in folders of the form "YYYY-MM-DD".  I cannot figure
out how to do this.

There seem to be three approaches to do this, all of which would be
useful but none of which I can get to work:

1. Specify the format of the exif date and time.  The "date and system
function" plugin lets you specify a custom date and time format.
Using the same syntax does not seem to work with exif date and time,
though.

2. Select a subset of the string.  The built-in functions let you do
this to the filename, but I cannot figure out a way to do this with
other arbitrary strings from functions

3. Regular expressions.  Making a regular expression to do this is
easy enough, but the folder separator gets converted to its HTML
character code: input: "(\d+)\:(\d+)\:(\d+) \d+:\d+\:\d+" output:
"\1-\2-\3"

Is there a way to get any of these method to work?

-Todd