Hello, how to show keys created between date?

I use code from your example:

var keys = ["North","East","South","West","Up","Down","In Space","In the deep blue sea"];
var result = new Array();
var v = null; var i = 0;
for (i = 0; i < keys.length; i++)
{ v = @DbLookup("","exampledata",keys[i], 1); result.push(v.length); }
result

I do not know how to add a date range.