Try this:
<drilldown>
<set token="clicked_earliest">$earliest$</set>
<set token="clicked_latest">$latest$</set>
<eval token="hetime">strftime("$clicked_earliest$", "%H:%M:%S")</eval>
<eval token="hltime">strftime("$clicked_latest$", "%H:%M:%S")</eval>
</drilldown>
$token_name$ will be inserted literally into your query, so the eval ended up looking like:
strftime(1234567890, "%H:%M:%S")
instead of
strftime("1234567890", "%H:%M:%S")
In the former, stftime is looking for a field named 01:23:45 , which isn't going to exist.
After editing this to look like actual timestamps, though, stftime should be able to take a timestamp (which is just an integer) without the quotes.
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