Hi,
To obtain the value of a date associated with a specific status in a stock.picking record and save it in a calculated field of type date, you can achieve this using Odoo's computed fields and searching through the stock.picking records based on their status.

Here's a general outline of how you can implement this:

Define a computed field in the stock.picking model to store the desired date value.

Use the @api.depends decorator to specify the dependencies for the computed field. In this case, it will depend on the status of the picking.

Implement the logic inside the computed field method to search for records with the desired status and retrieve the associated date value.

Here's an example implementation:from odoo import models, fields, api

class StockPicking(models.Model):
    _inherit = 'stock.picking'

    # Define a computed field to store the desired date value
    status_date = fields.Date(string='Status Date', compute='_compute_status_date', store=True)

    @api.depends('state')
    def _compute_status_date(self):
        for picking in self:
            # You can customize this logic based on your specific requirements
            if picking.state == 'confirmed':
                # Search for related moves, for example
                move = self.env['stock.move'].search([('picking_id', '=', picking.id)], limit=1)
                if move:
                    picking.status_date = move.date  # Assign the date value to the computed field
                else:
                    picking.status_date = False  # No move found, set the field value to False
            else:
                picking.status_date = False  # Set the field value to False if the status is not 'confirmed'

Hope it helps