SQL query to update post_date (one post = one single date & time)

Question

I have 120 posts of one category ready for my wordpress blog. For the moment, posts are drafts and I don't want to schedule them manually.

I want to publish them like this:

• 4 articles each day from the 1st of August 2013
• 1 at 10am / 1 at 2pm / 1 at 5pm / 1 at 8:30pm

What I need is the SQL query to:

• Update date_post for the 120 posts, based on the needs described above
• Change "draft" mode to "pending"
• The publication order is based on the creation date of the posts: the older will be the first published.

I'm lost in the queries and loops. If someone could help, it would be very very appreciated.

Thanks a lot,

Chris