/**
 *   Wechaty Chatbot SDK - https://github.com/wechaty/wechaty
 *
 *   @copyright 2016 Huan LI (李卓桓) <https://github.com/huan>, and
 *                   Wechaty Contributors <https://github.com/wechaty>.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 */
export function timestampToDate (timestamp: number): Date {
  /**
    * 1e11:
    *   in milliseconds:  Sat Mar 03 1973 09:46:39 UTC
    *   in seconds:       Wed Nov 16 5138 9:46:40 UTC
    */
  if (timestamp < 1e11) {
    timestamp *= 1000 // turn seconds to milliseconds
  }

  return new Date(timestamp)
}