how do i change the default post date and time??

how do i change the default post date and time??

it reads right now
September 26th, 2005

where and how do i change it,
i log to wp admin on options theres a time date feature there
i change the syntax, but nothing happens =(
the syntax there was F j, Y
i change it to l, F j, Y
it still reads September 26th, 2005 on the post is it something im doing wrong?
im also looking so that the time of post and the author appear, but i cant figure out.