tmpstart1:=@Date(EV_StartDT);
tmpstart:=@If(@IsError(tmpstart1); ""; tmpstart1);
tmpnumdays1:=@ToNumber(EV_DurationDays);
tmpnumdays:=@If(@IsError(tmpnumdays1); 1; tmpnumdays1);
tmpend:=@If(tmpstart=""; ""; tmpnumdays <2; tmpstart; @Adjust(tmpstart; 0; 0; tmpnumdays; 0; 0; 0));
@If(tmpstart=""; ""; tmpend=""; tmpstart;

@TextToTime(@Explode(@TextToTime(@Text(tmpstart) + "-" + @Text(tmpend)))) )