Edit date of a blog post


is it possible to edit the date of a blog post ?  I'de like to have one part of my site organized like a "memory" place and then be able to order post by real date, not just the date the user has posted the message. 

For example : on Sunday, there is an event I want to keep trace but I make a blog post related to it only on monday => it would be nice for me to change the post date to sunday and then have this event correctly ordered in my blog overview.

TIA for your help !