Thank you so much for your reply .

But in my situation im using odoo studio and automated actions like python expression .

what i need is :

once the user select the date and time the only thing i need to be saved and views is the time only .

if i go to automated actions on creation and update what would be the python expression for my field   datetime ??

not in XML  its on automated actions  when i select the field what is the python expression will be ?

please advice

make it fields.float

and in xml use widget float_time

for example:

in .py:

time = fields.Float(string="Time")

in xml:

<field name="time" widget="float_time" />