{
    "name": "joomla/datetime",
    "type": "joomla-package",
    "description": "Joomla DateTime Package",
    "keywords": ["joomla", "framework", "datetime"],
    "homepage": "https://github.com/joomla-framework/datetime",
    "license": "LGPL-2.1+",
    "require": {
        "php": ">=5.3.10",
        "symfony/translation": "~2.5"
    },
    "require-dev": {
        "phpunit/phpunit": "4.*",
        "squizlabs/php_codesniffer": "1.*"
    },
    "autoload": {
        "psr-4": {
            "Joomla\\DateTime\\": "src/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Joomla\\DateTime\\Test\\": "Tests/"
        }
    },
    "extra": {
        "branch-alias": {
            "dev-master": "2.x-dev"
        }
    }
}

{
    "name": "tomaszhanc/datetime",
    "type": "joomla-package",
    "description": "Joomla DateTime Package",
    "keywords": ["joomla", "framework", "datetime"],
    "homepage": "https://github.com/joomla-framework/datetime",
    "license": "LGPL-2.1+",
    "require": {
        "php": ">=5.3.10",
        "symfony/translation": "~2.5"
    },
    "require-dev": {
        "phpunit/phpunit": "4.*",
        "squizlabs/php_codesniffer": "1.*"
    },
    "autoload": {
        "psr-4": {
            "Joomla\\DateTime\\": "src/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Joomla\\DateTime\\Test\\": "Tests/"
        }
    },
    "extra": {
        "branch-alias": {
            "dev-master": "2.x-dev"
        }
    }
}

Change in the name for packagist
Change in the name for packagist