How to get translated month labels I think, this labels and its translations are available, but I don't know where. I found nothing in the "Translate Interface" seach.

So here's my question:
is there a way to get translated month labels more elegant as like t('january') ?
Normally date labels (months, day, etc. in short and long version) should be translated automatically according to the language configured for Drupal interface (admin/config/regional/settings).

However, in case there might have been an issue somewhere, with Drush and the module Localization update enabled the following command forces the translation to be updated and it solved the issue in my case:

drush l10n-update