misc/format_datetime.php


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<?php

function format_datetime(
    DateTimeInterface $dt,
    DateTimeZone|IntlTimeZone|string|null $tz = null
): string {
    static $formatter = new IntlDateFormatter(
    get_ui_language(),
    IntlDateFormatter::RELATIVE_MEDIUM,
    IntlDateFormatter::SHORT
    );
    $formatter->setTimeZone($tz ?? $dt->getTimezone());
    return $formatter->format($dt);
}