I do change my dates on my blog. I have many people think that they are crazy, but you are not. I just like to have the right date when I post my entries. That is why I go weeks without blogging then all of the sudden those weeks are full of posts.
The way that I do it is underneath the text section of the editor of the new blog post there is a "Post options" button. Click on that and there is a box that has Post date and time. Just change the date there. I am pretty sure that you can use this for future posts as well. Just put in when you want tthe post to publish and then it will at that time...I am not sure if that works, but it would be cool if it does!
I hope that eases some of your feelings of craziness and helps you that would like to be able to make others feel crazy!