I recently installed drupal 6.14 on Snow Leopard and got these timezone warnings.
warning: strtotime() [function.strtotime]: 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 'Asia/Tokyo' for 'JST/9.0/no DST' instead in /Users/<user>/Sites/drupal/sites/all/modules/views/modules/node/views_handler_argument_dates_various.inc on line 67.