AX - How check if DateEdit control is empty

if ( EDates.dateValue() == dateNull() ) {
  error( "Date value is empty." );
  EDates.setFocus();
}

AX - empty code

For empty code use method exceptionTextFallThrough():

if ( RDates.selection() == ProdRouteCardForm_Dates::BySchedule ) {
  exceptionTextFallThrough();
}

AX - How to get first and last day in month

Use this code:

int iMonth = 6;
int iYear = 2017;

date firstDate = mkDate( 1, iMonth, iYear );
date lastDate = endMth( firstDate );

info( date2str( firstDate, 321, DateDay::Digits2, DateSeparator::Hyphen, DateMonth::Digits2, 
      DateSeparator::Hyphen, DateYear::Digits4 ) );
info( date2str( lastDate, 321, DateDay::Digits2, DateSeparator::Hyphen, DateMonth::Digits2, 
      DateSeparator::Hyphen, DateYear::Digits4 ) );