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# Limitations
Even though the `DateTime` class is a subclass of `datetime`,
there are some rare cases where it can't replace the native class directly.
Here is a list (non-exhaustive) of the reported cases with a possible solution, if any:
* `sqlite3` will use the the `type()` function to determine the type of the object by default. To work around it you can register a new adapter:
```python
import pendulum
from sqlite3 import register_adapter
register_adapter(pendulum.DateTime, lambda val: val.isoformat(' '))
```
* `mysqlclient` (former `MySQLdb`) and `PyMySQL` will use the the `type()` function to determine the type of the object by default. To work around it you can register a new adapter:
```python
import pendulum
import MySQLdb.converters
import pymysql.converters
MySQLdb.converters.conversions[pendulum.DateTime] = MySQLdb.converters.DateTime2literal
pymysql.converters.conversions[pendulum.DateTime] = pymysql.converters.escape_datetime
```
* `django` will use the `isoformat()` method to store datetimes in the database. However, since `pendulum` is always timezone aware, the offset information will always be returned by `isoformat()` raising an error, at least for MySQL databases. To work around it, you can either create your own `DateTimeField` or use the previous workaround for `MySQLdb`:
```python
import pendulum
from django.db.models import DateTimeField as BaseDateTimeField
class DateTimeField(BaseDateTimeField):
def value_to_string(self, obj):
val = self.value_from_object(obj)
if isinstance(value, pendulum.DateTime):
return value.format('YYYY-MM-DD HH:mm:ss')
return '' if val is None else val.isoformat()
```
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