How to fix a rule on x axis using time

hello all,

I am trying to fix a fixed line to the x acse where time = 15:30 so that I can notice the bars that took longer than 15:30. what have i done wrong?

tha is my Code:

  "$schema": "",
  "title": "Event counts from all indexes",
  "layer": [
      "data": {
        "url": {
          "%context%": true,
          "%timefield%": "Date",
          "index": "index_tev_test",
          "body": {"size": 300, "_source": ["Date", "Start", "COMD Belege"]}
        "format": {"property": "hits.hits"}
      "mark": "bar",
      "encoding": {
        "y": {
          "field": "_source.Date",
          "type": "n",
          "sort": 0,
          "axis": {"title": "Datum "}
        "x": {
          "field": "_source.Start",
          "type": "nominal",
          "axis": {"title": "Start to COMD Belege"}
        "x2": {"field": "_source.COMD Belege", "type": "n"},
        "color": {"value": "green"}
      "data": {"values": {"foo": "bar"}},
      "transform": [
      //{"calculate": "field": "COMD Belege", "expr": "hours(datum.COMD Beleg)"}
      {"calculate": "time(1530)", "as": "now_field"}
      //{"calculate": [{"field": "hour", "expr": "hours("}],
      "mark": "rule",
      "encoding": {
        "x": {"aggregate": "mean", "type": "o", "field": "now_field"},
        "color": {"value": "red"},
        "size": {"value": 5}

the result is :slightly_frowning_face: :

Can you try setting it to

"value": 1331321

where you replace 1331321 with the equivalent for 15:30 instead of doing all that calculate stuff?
You would have to remove the aggregate, the type and the field properties.

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