How to Center title, date, sidebar on Blogger / Blogspot

Code to center your Header Image:

#header-inner img {margin: 0 auto;}

To center your Header’s Title and Description (text):

#header-inner {text-align: center;}

Code to center your Post Titles:

.post-title {text-align:center;}

Code to center your Post Dates:

.date-header {text-align:center;}