gistfile1.txt

mayo:~ curl -s "http://localhost:5984/cl-test/_fti/_design/search/by-body/?q=body:weather&debug=true&include_docs=true&sort=date_obj<date>" | json_reformat 
{
  "q": "body:weather",
  "plan": "TermQuery(body:weather,boost=1.0)",
  "etag": "121418c19bb3ca",
  "skip": 0,
  "limit": 25,
  "total_rows": 2,
  "search_duration": 0,
  "fetch_duration": 40,
  "sort_order": [
    {
      "field": "date_obj",
      "reverse": false,
      "type": "long"
    }
  ],
  "rows": [
    {
      "id": "doc2",
      "sort_order": [
        0
      ],
      "fields": {
        "date_obj_now": "DATE getTime: 1281737279186",
        "date_obj_doc": "DATE getTime: NaN",
        "date_str": "2010-08-12 22:55:57",
        "date_token": "20100812225557"
      },
      "doc": {
        "_id": "doc2",
        "_rev": "1-9fa09356dbea01454b8998e227bdef4a",
        "body": "Summer weather is hot.",
        "date": "2010-08-12 22:55:57"
      }
    },
    {
      "id": "doc1",
      "sort_order": [
        0
      ],
      "fields": {
        "date_obj_now": "DATE getTime: 1281737279194",
        "date_obj_doc": "DATE getTime: NaN",
        "date_str": "2010-08-13 22:55:10",
        "date_token": "20100813225510"
      },
      "doc": {
        "_id": "doc1",
        "_rev": "2-719fe4de5773260af4d9285c7bdddb72",
        "body": "Winter weather is cold.",
        "date": "2010-08-13 22:55:10"
      }
    }
  ]
}

index.js

function(doc) {
  var ret = new Document();

  ret.add(doc.body, {
    "field": "body"
  });

  // Add date as object so we can use it for sorting as well as range queries.
  // doc.date format is "2010-08-12 22:55:57"
  date_obj = new Date();
  ret.add("DATE getTime: " + date_obj.getTime(), {
    "type": "string",
    "field": "date_obj_now",
    "store": "yes"
  });

  date_obj = new Date(doc.date);
  ret.add("DATE getTime: " + date_obj.getTime(), {
    "type": "string",
    "field": "date_obj_doc",
    "store": "yes"
  });

  // Just the string (2010-08-12 22:55:57)
  ret.add(doc.date, {
    "field": "date_str",
    "store": "yes"
  });

  // Token (20100812225557)
  date_token = doc.date.replace(/[ :-]/g, '');
  ret.add(date_token, {
    "field": "date_token",
    "store": "yes"
  });

  return ret;
}