### Performance concerns
The helper methods in this class are instance methods and thus Date instances
need to be constructed before they can be used. The memory allocation can result
in noticeable performance degradation if you construct thousands of Date instances,
say, in a loop.
### Examples
**Basic usage**
$date = Date::factory('2007-07-24 14:04:24', 'EST');
$date->addHour(5);
echo $date->getLocalized("EEE, d. MMM y 'at' HH:mm:ss");