This field:

activity_date = models.DateField('Datum', default='17/06/2017')


Results in this migration:

class Migration(migrations.Migration):

    dependencies = [
        ('activities', '0006_auto_20161231_1703'),
    ]

    operations = [
        migrations.AlterField(
            model_name='activity',
            name='activity_date',
            field=models.DateField(default='17/06/2017', verbose_name='Datum'),
        ),
    ]


Which works fine on SQLite but gives this error on Postgres:

Operations to perform:
  Apply all migrations: activities, addressbook, admin, auth, contenttypes, 
sessions, users
Running migrations:
  Applying activities.0007_auto_20170103_2309...Traceback (most recent call 
last):
  File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/core/management/__init__.py"
, line 367, in execute_from_command_line
    utility.execute()
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/core/management/__init__.py"
, line 359, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/core/management/base.py"
, line 294, in run_from_argv
    self.execute(*args, **cmd_options)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/core/management/base.py"
, line 345, in execute
    output = self.handle(*args, **options)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/core/management/commands/migrate.py"
, line 204, in handle
    fake_initial=fake_initial,
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/migrations/executor.py"
, line 115, in migrate
    state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, 
fake_initial=fake_initial)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/migrations/executor.py"
, line 145, in _migrate_all_forwards
    state = self.apply_migration(state, migration, fake=fake, fake_initial=
fake_initial)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/migrations/executor.py"
, line 244, in apply_migration
    state = migration.apply(state, schema_editor)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/migrations/migration.py"
, line 129, in apply
    operation.database_forwards(self.app_label, schema_editor, old_state, 
project_state)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/migrations/operations/fields.py"
, line 204, in database_forwards
    schema_editor.alter_field(from_model, from_field, to_field)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/backends/base/schema.py"
, line 495, in alter_field
    old_db_params, new_db_params, strict)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/backends/postgresql/schema.py"
, line 117, in _alter_field
    new_db_params, strict,
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/backends/base/schema.py"
, line 578, in _alter_field
    new_default = self.effective_default(new_field)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/backends/base/schema.py"
, line 221, in effective_default
    default = field.get_db_prep_save(default, self.connection)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/models/fields/__init__.py"
, line 755, in get_db_prep_save
    prepared=False)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/models/fields/__init__.py"
, line 1280, in get_db_prep_value
    value = self.get_prep_value(value)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/models/fields/__init__.py"
, line 1275, in get_prep_value
    return self.to_python(value)
  File 
"/webapps/mzg/venv/lib/python3.5/site-packages/django/db/models/fields/__init__.py"
, line 1250, in to_python
    params={'value': value},
django.core.exceptions.ValidationError: ["'17/06/2017' waarde heeft een 
ongeldige datumnotatie. Deze moet in de YYYY-MM-DD notatie opgegeven 
worden."]



The error says: "DATE" has an invalid date notation. It must be submitted 
as YYYY-MM-DD notation. Timezone/locale is Europe/Amsterdam in case that 
makes a difference.


On Tuesday, January 3, 2017 at 2:17:36 PM UTC+1, Avraham Serour wrote:
>
> please post your migration file and the error
>
> On Tue, Jan 3, 2017 at 12:00 PM, <jorr...@gmail.com <javascript:>> wrote:
>
>> I recently set a default value in my local date format on a DateTimeField 
>> while I was using SQLite. The migration ran fine on my SQLite dev database, 
>> but when trying to apply the migration on my production Postgres database I 
>> got an error saying that a default value for DateTimeField must be in the 
>> format of 'YYYY-MM-DD'. Wouldn't it be prudent to force users to always 
>> specify the default value in the 'YYYY-MM-DD' format to avoid this problem 
>> of portability? (Not sure how MySQL handles it)
>>
>> -- 
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