Office Timeline allows you to change the language of your timeband and dates for communications with an international audience. The steps below explain how to use the add-in’s localization settings.
From your timeline slide, select the timeband and then click the Timescale Settings button that will show up in the Style Pane on the right.
In the Settings window that pops up, click on the Language dropdown menu to set your preference.
The add-in will automatically change the language of all dates on your timeline. In addition, the task duration counts and Today marker will also be translated.