Hi,
We're using Countdown Timer in non-English installation and the default formatting of on-hover date, which is non-localized with gmdate(), was unsatisfactory.
Hence a little change in the patch included against 2.4.3.
Firstly, it makes use of date_i18n() WordPress function instead of gmdate(). This change is backword-compatible, the date format used is the same.
Secondly, if the format date field in Countdown Timer settings is left blank, the default WordPress format, set on Settings page, is used as "[date], [format]".
Please consider merging this patch -- probably with fixes to settings instruction to make the behavior clear.