old_contents: // Dependencies
  var FsExtra = require("fs-extra")
    , Ul = require("ul")
    ;
  
  const STORE_PATH = Ul.USER_DIR + "/.git-stats";
  
  // Constructor
  var GitStats = module.exports = {};
  
  GitStats.record = function (data, callback) {
      FsExtra.readJSON(STORE_PATH, function (err, stats) {
          stats = stats || {};
          var thisRepo = stats[data.url] = Object(stats[data.url]);
          thisRepo[data.hash] = { date: data.date };
          FsExtra.writeJSON(STORE_PATH, stats, callback);
      });
  };
  
  GitStats.get = function (data, callback) {
      if (typeof data === "function") {
          callback = data;
          data = {};
      }
      FsExtra.readJSON(STORE_PATH, callback);
  };
  
new_contents: // Dependencies
  var FsExtra = require("fs-extra")
    , Ul = require("ul")
    , Moment = require("moment")
    ;
  
  const STORE_PATH = Ul.USER_DIR + "/.git-stats";
  
  // Constructor
  var GitStats = module.exports = {};
  
  /**
   * record
   * Records a new commit.
   *
   * @name record
   * @function
   * @param {Object} data The commit data containing:
   *
   *  - `date` (String|Date): The date object or a string in this format: `DDD MMM dd HH:mm:ss YYYY`
   *  - `url` (String): The repository remote url.
   *  - `hash` (String): The commit hash.
   *
   * @param {Function} callback The callback function.
   * @return {undefined}
   */
  GitStats.record = function (data, callback) {
      callback = callback || function (err) { if (err) throw err; };
      data = Object(data);
  
      if (typeof data.date === "string") {
          data.date = Moment(data.date, "DDD MMM dd HH:mm:ss YYYY");
      }
  
      if (!data.date || data.date.constructor !== Date || isNaN(data.date.getTime())) {
          return callback(new Error("The date field should be a string or a date object."));
      }
  
      if (typeof data.hash !== "string" || !data.hash) {
          return callback(new Error("Invalid hash."));
      }
  
      if (typeof data.url !== "string" || !data.url) {
          return callback(new Error("Invalid url field."));
      }
  
      FsExtra.readJSON(STORE_PATH, function (err, stats) {
          stats = stats || {};
          var day = data.date.format("MMM DDD dd, YYYY")
            , today = stats[day] = Object(stats[day])
            , repo = today[data.url] = Object(today[data.url])
            ;
  
          repo[data.hash] = { date: data.date };
  
          FsExtra.writeJSON(STORE_PATH, stats, callback);
      });
  };
  
  GitStats.get = function (data, callback) {
      if (typeof data === "function") {
          callback = data;
          data = {};
      }
      FsExtra.readJSON(STORE_PATH, callback);
  };
  
subject: Validate data.