Why Some Of My Dates Are Incorrect

I Have Had A Few People Comment About My Dates Being Incorrect On Some Of My Posts. This Is A Little Trick That I Use To Keep Certain Posts From Moving Downward. It Will Stay In Place Until The Advanced Date That You Put On It. I Read This Somewhere On The Internet. Handy Little Trick!! (To Do This You Will Have To Publish Your Post First, Then Go To Edit Posts And Click On Edit For This Post, Then Go To Post Options, And A Space Will Come Up To Put The Advanced Date In--Then Hit Publish Post Again, That's It!!) Hugs, Meadorlady