The new configuration page allows you to set the preferred stylesheet for this blog (this option used to be further down the page); you can also set the time zone for the blog’s contents to be displayed in.
A few shortcuts for common time zones: Eastern, Mountain, Pacific, GMT/BST, and Iraq. (Central is deliberately omitted, since it’s the default for this blog; if you’re in Indiana or Arizona, you’ll have to go and find your timezone yourself…)