This means you are missing the default timezone setting in your php.ini.
You can either set it on the top of the page:
or add it to your php.ini:
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.