Hello,
There is no any options for making date in spanish. You have to do it through child theme. Create a child theme and write some of line of code to change the date in to spanish. Please try with the help of google.
http://www.wpbeginner.com/beginners-guide/how-to-change-date-and-time-format-in-wordpress/
https://codex.wordpress.org/Child_Themes
If you buy our premium product, our dedicated team will provide you the child theme with the above features that you need. http://www.acmethemes.com/themes/acmeblogpro/
Please if you have any query, please feel free to ask.Best Regards,
Acme Supports