base.php

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<?php
function base()
{

    //Step 0: Declare dependencies
    global $DIC;

    $ui = $DIC->ui()->factory();
    $data = new ILIAS\Data\Factory();
    $renderer = $DIC->ui()->renderer();
    $request = $DIC->http()->request();
    $ctrl = $DIC->ctrl();

    //Step 1: define the inputs
    $date = $ui->input()->field()->dateTime("Pick a date/time", "This is the byline text");
    $formatted = $date
        ->withMinValue(new DateTimeImmutable())
        ->withFormat($data->dateFormat()->germanShort());
    $time = $date->withTimeOnly(true);
    $both = $date->withUseTime(true);

    //setting a timezone will return a date with this timezone.
    $tz = 'Asia/Tokyo';
    $timezoned = $both->withTimezone($tz)->withByline('Result-value will have TZ ' . $tz);

    //if you want a date converted to the timezone, do it on the date:
    $date_now = new DateTime('now');
    $date_zoned = new DateTime('now', new \DateTimeZone($tz));


    //here is the usage of Data/DateFormat
    $format = $timezoned->getFormat()->toString() . ' H:i';
    $timezoned_preset1 = $timezoned->withValue($date_now->format($format))
        ->withByline('This is local "now"');
    $timezoned_preset2 = $timezoned->withValue($date_zoned->format($format))
        ->withByline('This is "now" in ' . $tz);

    //Step 2: define form and form actions
    $form = $ui->input()->container()->form()->standard('#', [
        'date' => $date,
        'formatted' => $formatted,
        'time' => $time,
        'both' => $both,
        'timezoned' => $timezoned,
        'timezoned_preset1' => $timezoned_preset1,
        'timezoned_preset2' => $timezoned_preset2,
        'disabled' => $date
            ->withValue($date_now->format($format))
            ->withLabel('disabled')
            ->withDisabled(true)
    ]);

    //Step 3: implement some form data processing.
    if ($request->getMethod() == "POST") {
        $form = $form->withRequest($request);
        $result = $form->getData();
    } else {
        $result = "No result yet.";
    }

    //Step 4: Render the form.
    return
        "<pre>" . print_r($result, true) . "</pre><br/>" .
        $renderer->render($form);
}