How can I set dates on the X axis of a plotly chart?

Getting started on plotly. I import from Yahoo, quotes of two values ​​doing:

import pandas as pd
import pandas_datareader as pdr 

dicc_tickers = {"Apple":'AAPL', "Google":'GOOG'}

from pandas_datareader import data as pdr
import datetime

def get(tickers, startdate, enddate):
    def data(ticker):
        return (pdr.DataReader(ticker, 'yahoo' ))
    datas = map (data, tickers)
    return(pd.concat(datas, keys=tickers, names=['Ticker', 'Date']))

startdate = "2016-1-4"
enddate = "2020-10-30"
tickers = dicc_tickers.values()
cotizaciones = get(tickers, datetime.datetime(2006, 10, 1), datetime.datetime(2012, 1, 1))
datos_yahoo = cotizaciones[['Adj Close']].reset_index().pivot('Date', 'Ticker', 'Adj Close')
df = datos_yahoo.resample('M').mean()

Below I try to present the graphs of the historical evolution of these average monthly prices. I need a date scale on the X axis, executing the following script:

import chart_studio.plotly as ply
import plotly.graph_objs as go
import numpy as np

df = datos_yahoo[["AAPL", "GOOG"]]["2016-1-4":"2020-11-15"].resample('M').mean()

x = df.index.values
y1 = df["AAPL"]
y2 = df["GOOG"]
trace1 = go.Scatter(
   x = x,
   y = y1,
   name = 'AAPL'
)
trace2 = go.Scatter(
   x = x,
   y = y2,
   name = 'GOOG',
   yaxis = 'y2'
)
data = [trace1, trace2]
layout = go.Layout(
   title = 'Double Y Axis Example',
   yaxis = dict(
      title = 'AAPL',zeroline=True,
      showline = True
   ),
   yaxis2 = dict(
      title = 'GOOG',
      zeroline = True,
      showline = True,
      overlaying = 'y',
      side = 'right'
   )
)
fig = go.Figure(data=data, layout=layout)
iplot(fig)

To do this, I define the variable x: x = df.index.values But I can't get the date scale to appear on the x axis. How can I get this scale on the chart? I will appreciate your suggestions.