How to change dates of all my posts (Urgent!)

Hi,

I encountered a huge problem with the dates of all my posts. Apparently, ever since I imported a few post from my previous website, the dates seemed to stop at 12 December 2012.

This is getting very annoying as every new post I publish also have 12 December 2012 as the date of publish even when the day is clearly shown that it shouldn’t be on the 12 December 2012.

I am baffled as to what I can do. When I check my published post on my dashboard, it’s clearly stated the date but upon looking at the blog, it’s appears to be 12 December 2012.

Is there something I can do? Please help me because I am at my wits already. Thanks

Here’s my link: http://thedessertprince.com/blog/

PS: take note of the difference of the day and date of each posts and you will know what I mean.