Get a datetime object for a date between January 1, 1970 and now

Parameters

\DateTime \| int \| string	$max	maximum timestamp used as random end limit, default to "now"
string	$timezone	time zone in which the date time should be set, default to DateTime::$defaultTimezone, if set, otherwise the result of `date_default_timezone_get` ('2005-08-16 20:39:21')

See also: http://php.net/manual/en/timezones.php; http://php.net/manual/en/function.date-default-timezone-get.php