How to use and manipulate Date field in Odoo

odoo_date_field_conversion.py

from datetime import datetime, timedelta, date

class some_model(models.Model):    
    _name = 'some.model'
    
    # creating date field in odoo class
    date_start = fields.Date(string="Start Date")
    
    @api.one
    def button_click(self):
        # converting string date value into python date object
        date_start = datetime.strptime(self.date_start, '%Y-%m-%d').date()

For Details: https://learnopenerp.blogspot.com/2021/07/how-to-use-and-convert-date-field-format-odoo.html