date.php

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

//@todo popup_calendar deprecated in 1.8.  Remove in 2.0
$vars['class'][] = 'popup_calendar';

$defaults = array(
    'value' => '',
    'disabled' => false,
    'timestamp' => false,
    'type' => 'text'
);

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

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

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

// convert timestamps to text for display
if (is_numeric($vars['value'])) {
    $vars['value'] = gmdate('Y-m-d', $vars['value']);
}

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

echo elgg_format_element('input', $vars);

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