What determines (how to configure) what format string is used by php PDO driver for values of date and timestamp fields?

Question

I have Firebird 3.0 database which have date and timestamp fields and I am using interbase extension (yes - still interbase) and Yii2 framwork in PHP 7.x. And I have Yii code:

Answer 1

If you are looking to confgure globally the format in Yii2, there are a few localized settings in your common config you should set:

Config Example

'timeZone' => 'America/New_York', // Default PHP date in Eastern.
//... other config stuff
'components' => [
    'formatter' => [
        'dateFormat' => 'php:Y-m-d',
        'datetimeFormat' => 'php:Y-m-d H:i:s',
        'decimalSeparator' => '.',
        'thousandSeparator' => ',',
        'defaultTimeZone' => 'UTC',       // DB Source is stored as UTC timezone.
        'timeZone' => 'America/New_York', // When formatter is used, convert to this timezone.
    ],
    //... other config stuff
  ]

Time Checks

Localized timezones can be a pain to manage, so create a page so you better understand localized formatting. See Yii2 Internationalization Docs

select('NOW()')->scalar(Yii::$app->db);
?>

    

        
PHP UTC dateTime (+4 Hours):
        

    
    

        
PHP local dateTime:
        

    
    

        
PHP local timeZone:
        

    
    

        
Database Time Raw (expected UTC):
        

    
    

        
Formatter -> UTC to local dateTime:
        
formatter->asDatetime(gmdate('Y-d-m H:i:s')) ?>
    
    

        
Formatter -> realtiveTime from UTC:
        
formatter->asRelativeTime(gmdate('Y-m-d H:i:s')) ?>