warning: strtotime() [function.strtotime]: It is not safe to rely on the system’s timezone settings.

php.ini file location on mac os x is /private/etc/php.ini

to fix this error:

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.

add date.timezone = “America/New_York” to your php.ini file.