Set Financial Dimensions by X++ code in AX 2012/Setting one Dimension value in the combination

    /// <summary>
    /// replace specific financial dimension value in DefaultDimension based on the LedgerParameters setup
    /// </summary>
    /// <param name = "_defaultDimensionFrom">DefaultDimension recId the value should be taken from</param>
    /// <param name = "_defaultDimensionTo">DefaultDimension recId the value should be assigned to</param>
    /// <returns>returns new DefaultDimension recId if conditions are met</returns>
    public static DimensionDefault replaceDefaultDim(DimensionDefault _defaultDimensionFrom, DimensionDefault _defaultDimensionTo)
    {
        if(!_defaultDimensionFrom)
        {
            return _defaultDimensionTo;
        }

        LedgerParameters ledgerParameters = LedgerParameters::find();

        if (ledgerParameters.DepartmentSetFinancialDimension &&
            ledgerParameters.DepartmentDimensionAttribute)
        {
            DimensionAttribute                  dimAttr;
            DimensionAttributeValue             dimAttrValue;
            DimensionAttributeValueSetStorage   davss;

            davss = DimensionAttributeValueSetStorage::find(_defaultDimensionTo);

            dimAttr = DimensionAttribute::find(ledgerParameters.DepartmentDimensionAttribute);

            DimensionAttributeValueSetStorage dimStorage = DimensionAttributeValueSetStorage::find(_defaultDimensionFrom);
            DimensionValue dimValue = dimStorage.getDisplayValueByDimensionAttribute(dimAttr.RecId);

            dimAttrValue = DimensionAttributeValue::findByDimensionAttributeAndValue(dimAttr, dimValue);

            if(dimAttrValue && !davss.containsDimensionAttributeValue(dimAttrValue.RecId))
            {
                davss.addItem(dimAttrValue);

                return davss.save();
            }
        }

        return _defaultDimensionTo;
    }

Conversion from UTCDateTime to Date or Time in AX

Here is an example of correct conversion between UTCDateTime value and Date and Time value which is associated with user preferred time zone:
public static void testDateTimeConversion()
{
    utcDateTime dateTime;
    date dateInUserTimeZone;
    TimeOfDay timeInUserTimeZone;

    dateTime = DateTimeUtil::utcNow();

    dateInUserTimeZone = DateTimeUtil::date(DateTimeUtil::applyTimeZoneOffset(dateTime, DateTimeUtil::getUserPreferredTimeZone()));
    timeInUserTimeZone = DateTimeUtil::time(DateTimeUtil::applyTimeZoneOffset(dateTime, DateTimeUtil::getUserPreferredTimeZone()));

    dateTime = DateTimeUtil::newDateTime(dateInUserTimeZone, timeInUserTimeZone, DateTimeUtil::getUserPreferredTimeZone());
}