code: function _createRotatedLogName(logPath, modifiedDate){
      var logName = logPath,
          suffixIdx = logPath.lastIndexOf('.'),
          suffix = '';
  
      if(suffixIdx > -1){
          suffix = logName.substr(suffixIdx, logName.length);
          logName = logName.replace(
              suffix, ('.' +
                  modifiedDate.getFullYear() +
                  '-' + (modifiedDate.getMonth() + 1) +
                  '-' + modifiedDate.getDate()
                  ) + suffix
              );
      }
      else {
          logName = logName +
              ('.' + modifiedDate.getFullYear() + '-' + (modifiedDate.getMonth() + 1) + '-' + modifiedDate.getDate());
      }
  
      return logName;
  }
docs: Method that will take the passed in logPath and recreate the path with a modified file name. So if a file
  was modified on a previous day and a new log is coming in on the current day, then we want to rename the
  old log file with the date in the name.
  @param logPath Path of current log file
  @param modifiedDate Last file modified date
  @returns {string} New file path for previous log