Get date format that matched the date string

Is it possible to get back the date format that was matches and used for parsing?

If not, then I guess that would be a feature request.

so
dateparser.guessFormat('20170705') = '%Y%m%d'

a little bit more complex version can get an array of date strings as an argument and return a date format only if all the dates in array match the format. That will help to avoid situation when certain date strings can not be identified uniquely like 01-03-2017 may be Jan 03, or Mar 01.

The original use case is to help user with the format definition. So application get file as input, analyze data in the file with some sampling and try to create a nice parser for the given file. User input is required to some extent, but the desire is to minimize the hassle from the user side.

The proposed entry point is dateparser.guessFormat, with a single date string or an array of date strings as input. Start by reviewing the existing parsing and format-detection behavior; done means returning the format used for an unambiguous string and handling arrays only when all values match consistently.