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When a BLOG post is made to the fuel_blog_posts table, I get the following:
post_date: 2015-08-06 08:14:00
date_added: 2015-06-08 08:14:54
last_modified: 2015-06-08 12:18:55
I tried changing the date on the update page using the date picker, but it still comes out wrong. I'm in Canada, so our computers are set to dd/mm/YYYY format. Anyway, looks like date_added and last_modified are doing it right, but post_date is probably hard-coded to american style.