mysql-gateway timezone not working about plyql HOT 1 CLOSED

$ plyql -h dm -q "SELECT TIME_FLOOR(TIMESTAMP '2016-09-11 12:34.56', 'P1D') as A" --output json
[
  {
    "A": {
      "type": "TIME",
      "value": "2016-09-11T00:00:00.000Z"
    }
  }
]
$ plyql -h dm -q "SELECT TIME_FLOOR(TIMESTAMP '2016-09-11 12:34.56', 'P1D') as A" --timezone America/Los_Angeles --output json
[
  {
    "A": {
      "type": "TIME",
      "value": "2016-09-11T07:00:00.000Z"
    }
  }
]
$ plyql -h dm -q "SELECT TIME_FLOOR(TIMESTAMP '2016-09-11 12:34.56', 'P1D') as A" --timezone Asia/Shanghai --output json
[
  {
    "A": {
      "type": "TIME",
      "value": "2016-09-10T16:00:00.000Z"
    }
  }
]
$ plyql -h dm -q "SELECT TIME_FLOOR(TIMESTAMP '2016-09-11 12:34.56', 'P1D', 'Asia/Shanghai') as A" --output json
[
  {
    "A": {
      "type": "TIME",
      "value": "2016-09-10T16:00:00.000Z"
    }
  }
]