## format_date_time(value, format, calendar_type) {#datetime_str_calendartype}

Called when Aspose.Words applies a date/time format switch, i.e. \\@ "dd.MM.yyyy".


```python
def format_date_time(self, value: datetime.datetime, format: str, calendar_type: aspose.words.CalendarType):
    ...
```

| Parameter | Type | Description |
| --- | --- | --- |
| value | datetime.datetime |  |
| format | str |  |
| calendar_type | [CalendarType](../../../aspose.words/calendartype/) |  |

### Remarks

The implementation should return ``None`` to indicate that the default formatting should be applied.



### See Also

* module [aspose.words.fields](../../)
* class [IFieldResultFormatter](../)