Why does date range picker return values with time for first time and only dates after that?

dash_core_components.DatePickerRange first returns dates with time when selected dates for the first time and only dates from second time onwards.

In below example, I am printing dates as i select dates from picker.
when i select nothing:

when i choose first date:

after i choose second date:

and this is the way it returns after this.

Here’s my code:

from dash import Dash
import dash_core_components as dash_core
import dash_html_components as dash_html
from dash.dependencies import Input, Output
from datetime import datetime


check_app = Dash(__name__)

check_app.layout = dash_html.Div(
    children=[
        dash_core.DatePickerRange(id='check_date_picker',
                                  start_date=datetime(2014, 1, 1),
                                  end_date=datetime(2015, 1, 31)),
        dash_html.Br(),dash_html.Br(),
        dash_html.H6(id='printing_dates')
    ]
)


@check_app.callback(Output(component_id='printing_dates', component_property='children'),
                    [Input(component_id='check_date_picker', component_property='start_date'),
                     Input(component_id='check_date_picker', component_property='end_date')])
def print_selected_dates(start_date, end_date):
    return str((start_date, end_date))


if __name__ == "__main__":
    check_app.run_server()

How do i have dash always return only the dates?

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