date issue – inside post content

Guys,

I’m using to plugin to import posts.

Inside post content, we have to inform a specific date.
The text is as follow (pt-br):
domingo – 03/01/2016

When we import it, the plugin seems to change the text to:
Sunday – 03/01/amamamam 🙁

I believe its looking inside for content that is php date compatible, and finds parts of it.
How can I make the post so it show the way it was supposed to?

https://ww.wp.xz.cn/plugins/wp-all-import/