Filter fields type Date/Time (like Createddatetime) in query of Form

Below a piece of x++ about the build of a filter related to the query of a form

QueryBuildDataSource qbds;
str rangestr, rangeStrFrom, rangeStrTo;
str dateFrom, dateTo;


if(createdDateFrom.dateValue() != datenull())
{
    dateFrom =  datetimeutil::toStr(datetimeutil::newDateTime(createdDateFrom.dateValue(), 0, datetimeutil::getCompanyTimeZone()));
    rangestrFrom = strfmt('(%1 >= %2)',
                 fieldstr(salestable, createddatetime),
                 datefrom);
}

if(createdDateTo.dateValue() != datenull())
{
    dateto = datetimeutil::toStr( datetimeutil::newDateTime(createdDateTo.dateValue(), 86400, datetimeutil::getCompanyTimeZone()));  //max value of time
    rangestrTo = strfmt('(%1 <= %2)',
                 fieldstr(salestable, createddatetime),
                 dateTo);
}

if(rangestrFrom && ! rangestrTo)
    rangestr = rangestrFrom;
else if(!rangestrFrom && rangestrTo)
    rangestr = rangestrTo;
else if(rangestrFrom && rangestrTo)
    rangestr = "(" + rangestrFrom + " && " + rangestrTo + ")";





  if(!salesLine_ds.query().dataSourceTable(tableNum(SalesTable)))
  {
      qbds = salesLine_ds.query().dataSourceTable(tablenum(salesLine)).addDataSource(tablenum(salestable));
      qbds.relations(true);
  }
  else
      qbds = salesLine_ds.query().dataSourceTable(tablenum(salesTable));

  qbds.clearRange(fieldnum(salesTable, createddatetime));
  qbds.addRange(fieldnum(salesTable, createddatetime)).value(rangestr);