Admin - Configuration - Logging - Store Parse Date Time Format - Admin

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Menu: Admin - Configuration - Logging - Store Parse Date Time Format - Admin

/path/to/your/shop/admin/includes/classes/logger.php

Line #59 : error_log(strftime(STORE_PARSE_DATE_TIME_FORMAT) . ' [' . $type . '] ' . $message . "\n", 3, STORE_PAGE_PARSE_TIME_LOG);