分类:使用者及日期无效的语言条目

本页面是一个维护分类，用以维护维基百科计划。由于并非百科全书的一部分，因此本分类或是不含条目页面，或是按状态而非主题收录条目页面。请勿将本分类包含在常规的分类页面中。 本分类另有以下功能： 隐藏分类：除非在“参数设置 → 外观”中勾选“显示隐藏分类”，否则本分类将不会在常规页面中显示。

This category is triggered if something other than a purely numerical value is entered in the date field of a language infobox. (Note that this does not happen if a merely unlikely date is entered.) An invalid input affects the display of the infobox as well as its ability to detect obsolete data.

Entering 'NA' or 'no date' in the date field triggers a subcategory. Though it does not cause any problems with display, it does prevent the obsolescence calculation.