Formatter is a Yii application component that is used format view data in readable format for users. By default, the formatter is implemented by yii\i18n\Formatter, which provides a set of methods to format data as date/time, numbers, currencies, and other commonly used formats. You can use the formatter as the following,
$formatter = \Yii::$app->formatter;
// output: January 1, 2021
echo $formatter->asDate('2021-01-01', 'long');
// output: 12.50%
echo $formatter->asPercent(0.125, 2);
// output: jtp@example.com
echo $formatter->asEmail('jtp@example.com');
// output: Yes
echo $formatter->asBoolean(true);
// it also handles display of null values:
// output: (not set)
echo $formatter->asDate(null);
