Hi,

Try with the following code.

Python

from_period = fields.Date(string="From Date", required=True,
                          help="Choose the from date")
to_period = fields.Date(string="To Date", required=True,
                        help="Choose the to date")

XML

<label for="from_period" string="Period"/>
<div class="o_row">
    <field name="from_period" widget="daterange" nolabel="1"
           class="oe_inline"
           options="{'related_end_date': 'to_period'}"/>
    <i class="fa fa-long-arrow-right mx-2"
       aria-label="Arrow icon" title="Arrow"/>
    <field name="to_period" widget="daterange" nolabel="1"
           class="oe_inline"
           options="{'related_start_date': 'from_period'}"/>
</div>

Hope it helps

Hi Kedar Dave, 

Use 

<field name="date_begin" widget="daterange" options="{'related_end_date': 'date_end'}"/>
<field name="date_end" widget="daterange" options="{'related_start_date': 'date_begin'}"/>

Hope this help.