date_picker

from bokeh.io import show
from bokeh.models import CustomJS, DatePicker

date_picker = DatePicker(
    title="Select date",
    value="2019-09-20",
    min_date="2019-08-01",
    max_date="2019-10-30",
)
date_picker.js_on_change("value", CustomJS(code="""
    console.log("date_picker: value=" + this.value, this.toString())
"""))

show(date_picker)