time.php

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<?php
use Elgg\Exceptions\DataFormatException;

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

$defaults = [
    'timestamp' => false,
    'format' => elgg_get_config('time_format', elgg_echo('input:time_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']);

$min = (int) elgg_extract('min', $vars, 0);
unset($vars['min']);

$max = (int) elgg_extract('max', $vars, 24 * 60 * 60);
unset($vars['max']);

$step = (int) elgg_extract('step', $vars, 15 * 60);
unset($vars['step']);

$value = elgg_extract('value', $vars);
$value_time = '';
$value_timestamp = '';
if ($value) {
    try {
        $dt = \Elgg\Values::normalizeTime($value);

        // round value to the closest divisible of a step
        $next_step_ts = (int) ceil($dt->getTimestamp() / $step) * $step;
        $dt->setTimestamp($next_step_ts);

        $value_timestamp = $dt->format('H') * 60 * 60 + $dt->format('i') * 60;
        $value_time = $dt->format($format);
    } catch (DataFormatException $ex) {
        // $value is not a valid datetime, using blank value
    }
}

if ($timestamp) {
    $vars['value'] = $value_timestamp;
} else {
    $vars['value'] = $value_time;
}

$hour_options = [];
$hour_options_ts = range($min, $max, $step);

$dt = new DateTime('now', new DateTimeZone('UTC'));

foreach ($hour_options_ts as $ts) {
    $dt->setTimestamp($ts);
    $key = ($timestamp) ? $dt->getTimestamp() : $dt->format($format);
    $hour_options[$key] = $dt->format($format);
}

$vars['options_values'] = $hour_options;

echo elgg_view('input/select', $vars);