Value based on Date, Time and High or Low user selected from drop down list

Row I is a drop down list of Date derived from Row A
Row J is a drop down list of time derived from Row G
Row K is a drop down list of High or Low derived from cell C1, D1

Row L (Valued needed based on Row I, J, K selection)
Value based on Date, Time and High or Low user selected from drop down list

Thanks in advance for any help much appreciated :-)
Johnny