Function timeOffset

docs/app/js/sanddance-app.js:111380–111382

(unit, date, step)

    return ival ? ival.offset(date, step) : undefined;
}
function timeOffset(unit, date, step) {
    return offset(timeInterval(unit), date, step);
}
function utcOffset(unit, date, step) {
    return offset(utcInterval(unit), date, step);
}