Store NULL if no date selected rather than ""
Store NULL if no date selected rather than ""

xepan/atk4,atk4/atk4,atk4/atk4,svisystem/atk4,samratcis/atk4,samratcis/atk4,svisystem/atk4,xepan/atk4,samratcis/atk4,svisystem/atk4,atk4/atk4,atk4/atk4,xepan/atk4