Warning while opening website

Hello,
When I open my website there is a quick glimpse of a warning. I can’t figure out what it is, but when I go into the login page there is a warning there which stats-

“Warning: define(): It is not safe to rely on the system’s timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected ‘America/New_York’ for ‘-4.0/DST’ instead in E:\wwwroot\www.cinemadesigngroup.com.wordpress\wp-config.php on line 73 Notice: Constant WP_DEBUG already defined in E:\wwwroot\www.cinemadesigngroup.com.wordpress\wp-config.php on line 73 “

My website is http://www.cinemadesigngroup.com/