EDTF PHP Library

EDTF PHP is a small library for parsing, representing and working with the Extended Date/Time Format specification.

Usage

Parsing

$parser = \EDTF\EdtfFactory::newParser();
$parsingResult = $parser->parse('1985-04-12T23:20:30');
$parsingResult->isValid(); // true
$parsingResult->getEdtfValue(); // \EDTF\EdtfValue
$parsingResult->getInput(); // '1985-04-12T23:20:30'

Validating

$validator = \EDTF\EdtfFactory::newValidator();
$validator->isValidEdtf('1985-04-12T23:20:30'); // true

Humanizing

$humanizer = \EDTF\EdtfFactory::newStringHumanizerForLanguage( 'en' );
$humanizer->humanize('1985-12/2004~'); // 'December 1985 to circa 2004'

$humanizer = \EDTF\EdtfFactory::newHumanizerForLanguage( 'en' );
$humanizer->humanize($edtfValue); // string

Object model

$edtfValue->getMax(); // int
$edtfValue->getMin(); // int
$edtfValue->covers(\EDTF\EdtfValue $anotherValue); // bool

$edtfDate->getYear(); // int
$edtfDate->isOpenInterval(); // bool
$edtfDate->getQualification(); // \EDTF\Qualification

EDTF support / limits

All level 0, 1 and 2 EDTF formats can be parsed and represented, except for:

• Open ranges with a date (Level 2: Qualification): ..2004-06-01/2004-06-20 (This is supported: ../2004-06-20)

Humanization has more limits:

• Significant digits (EDTF level 2): 1950S2 (some year between 1900 and 1999, estimated to be 1950)
• Group Qualification (EDTF level 2): 2004-06~-11 (year and month approximate)
• Qualification of Individual Component (EDTF level 2): ?2004-06-~11 (year uncertain; month known; day approximate)
• Level 2 Unspecified Digit: 1XXX-1X (October, November, or December during the 1000s)

Installation

To use the EDTF library in your project, simply add a dependency on professional-wiki/edtf to your project's composer.json file. Here is a minimal example of a composer.json file that just defines a dependency on EDTF 1.x:

{
    "require": {
        "professional-wiki/edtf": "~1.0"
    }
}

Development

Start by installing the project dependencies by executing

composer update

You can run the tests by executing

make test

You can run the style checks by executing

make cs

To run all CI checks, execute

make ci

You can also invoke PHPUnit directly to pass it arguments, as follows

vendor/bin/phpunit --filter SomeClassNameOrFilter