Date matching: 23 Nov 1999 ≠ 23 Nov. 1999

I am using Hazel on a German-language system, which unfortunately has an impact on the possibilities concerning date matching. In this very case the date-format lacks an option for a three-letter month WITHOUT a dot.

Atlassian sends its invoices with a date formated like this: 23 Jan 1999.
The only thing I can match with Hazel's date-funtion is: 23 Jan. 1999. (Note the dot!)

How can I match 23 Jan 1999, when there is no option to select a three-letter month WITHOUT a dot in Hazel?

I think it may have to do with OS X thinking that Jan. (with the period) is how you represent dates in short form. You can try adding additional languages in your System Preferences language list to see if any of those fare better. Maybe there is another country's version of the same language that doesn't have the period?