wiltave

With this plugin you can translate date and time, using the_time, get_the_time, the_date and get_the_date in your themes. For example: If your WordPress installation is in English, you can translate just date and time to Brazilian Portuguese.
In the file configuration.php you can set the locale, charset, and date / time format. The format key must follow the strftime format parameter (http://php.net/manual/en/function.strftime.php).
You must call the_time, get_the_time, the_date or get_the_date in you theme, within The Loop. Parameters are going to be ignored.
This plugin uses set_locale function and it will fail if you don’t have the desired locale/charset installed on your server. For more information, please read the manual (http://php.net/manual/en/function.setlocale.php).

Calendar Translation

Replaces the_time, get_the_time, the_date and get_the_date functions to translate date and time.

Studio Hyperset

oqm4

Spark Development

Bruno Cantuaria

Extending WordPress’ literary, documentary & archival potential, this plugin allows publishers to easily customize the publication year of posts & pages.

Advanced Dates

Allows publishers to easily customize the publication year of posts and pages.

Calendar Translation vs Advanced Dates