如何在Odoo日期时间字段中显示不同的日期格式？

from odoo import models, fields, api

class MyModel(models.Model):
    _name = 'my.model'

    date_time_field = fields.Datetime(string='Date Time Field')

    @api.onchange('date_time_field')
    def _onchange_date_time_field(self):
        if self.date_time_field:
            self.date_time_field = fields.Datetime.to_string(self.date_time_field)

@api.onchange('date_time_field')
def _onchange_date_time_field(self):
    if self.date_time_field:
        self.date_time_field = self.date_time_field.strftime('%Y-%m-%d')