date.php

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<?php
use Elgg\Exceptions\DataFormatException;

$vars['class'] = elgg_extract_class($vars, 'elgg-input-date');

$defaults = [
    'value' => '',
    'disabled' => false,
    'timestamp' => false,
    'autocomplete' => 'off',
    'type' => 'text',
    'format' => elgg_get_config('date_format', elgg_echo('input:date_format')),
];

$vars = array_merge($defaults, $vars);

$timestamp = elgg_extract('timestamp', $vars);
unset($vars['timestamp']);

$format = elgg_extract('format', $vars, $defaults['format'], false);
unset($vars['format']);

$name = elgg_extract('name', $vars);
$value = elgg_extract('value', $vars);

$value_date = '';
$value_timestamp = '';

if ($value) {
    try {
        $dt = \Elgg\Values::normalizeTime($value);

        $value_date = $dt->format($format);
        $value_timestamp = $dt->getTimestamp();
    } catch (DataFormatException $ex) {
        // $value is not a valid datetime, using blank value
    }
}

if ($timestamp) {
    if (!isset($vars['id'])) {
        $vars['id'] = $name;
    }
    echo elgg_view('input/hidden', [
        'name' => $name,
        'value' => $value_timestamp,
        'rel' => elgg_extract('id', $vars),
    ]);
    $vars['class'][] = 'elgg-input-timestamp';
    unset($vars['name']);
}

$vars['value'] = $value_date;

$datepicker_options = (array) elgg_extract('datepicker_options', $vars, []);
unset($vars['datepicker_options']);

if (empty($datepicker_options['dateFormat'])) {
    $datepicker_options['dateFormat'] = elgg_get_config('date_format_datepicker', elgg_echo('input:date_format:datepicker'));
}

$vars['data-datepicker-opts'] = $datepicker_options ? json_encode($datepicker_options) : '';

echo elgg_format_element('input', $vars);

if (isset($vars['id'])) {
    $selector = "#{$vars['id']}";
} else {
    $selector = ".elgg-input-date[name='{$name}']";
}
?>
<script>
    require(['input/date'], function (datepicker) {
        datepicker.init(<?= json_encode($selector) ?>);
    });
</script>