docs: 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;
  }