Set Date Only Lookup Columns

var lookupId = "lookupInvoice";
var dateOnlyFieldIndexes = "1,3"; // this is the indexes of the date column(s) in the lookup

ScriptManager.RegisterStartupScript(this, GetType(), "script_CustomizeInvoiceLookup", @"
    require(['dojo/aspect', 'Sage/UI/SDataLookup'], function(aspect, SDataLookup) {
        aspect.after(SDataLookup.prototype, '_formatStructure', function() {
            if (this.id.indexOf('%LOOKUP%') !== -1)) {
                var colIndexes = '%INDEXES%'.split(',');
                for(var i = 0; i < colIndexes.length; i++) {
                    var col = this.structure[parseInt(colIndexes[i].trim())+1];
                    if (col) col.dateOnly = true;
                }
            }
        });
    });
".Replace("%LOOKUP%", lookupId).Replace("%INDEXES%", dateOnlyFieldIndexes), true);