Get Worker Primary Position in valid date time in X++ / Worker Primary Position in Ax

Here is the X++ code to find  Worker Primary Position in given date time

public static HcmWorkerPrimaryPosition findByWorker(

    HcmWorkerRecId      _worker,

    utcdatetime         _validFrom = DateTimeUtil::utcNow(),

    utcdatetime         _validTo   = _validFrom,

    boolean             _forUpdate = false,

    ConcurrencyModel    _concurrencyModel = ConcurrencyModel::Auto)

    {

        HcmWorkerPrimaryPosition hcmWorkerPrimaryPosition;

        hcmWorkerPrimaryPosition.selectForUpdate(_forUpdate );

        if (_forUpdate && _concurrencyModel != ConcurrencyModel::Auto)

        {

            hcmWorkerPrimaryPosition.concurrencyModel(_concurrencyModel);

        }

        if (_worker)

        {

            if (prmisdefault(_validFrom) && prmisdefault(_validTo))

            {

                select firstonly hcmWorkerPrimaryPosition

                    where hcmWorkerPrimaryPosition.Worker == _worker;

            }

            else if (_validFrom == _validTo)

            {

                select firstonly ValidTimeState(_validFrom) hcmWorkerPrimaryPosition

                    where hcmWorkerPrimaryPosition.Worker == _worker;

            }

            else

            {

                select ValidTimeState(_validFrom, _validTo) hcmWorkerPrimaryPosition

                    where hcmWorkerPrimaryPosition.Worker == _worker;

            }

        }

        return hcmWorkerPrimaryPosition;

    }