---
id: "P:cAlgo.API.DateTimePickerValueChangedEventArgs.OldValue"
kind: "property"
type: "T:cAlgo.API.DateTimePickerValueChangedEventArgs"
url: "https://help.ctrader.com/ctrader-algo/references/EventArgs/DateTimePickerValueChangedEventArgs/OldValue/"
---

> Documentation index for agents: https://help.ctrader.com/ctrader-algo/llms.txt · machine index: https://help.ctrader.com/ctrader-algo/api.json

# DateTimePickerValueChangedEventArgs.OldValue

Member of [DateTimePickerValueChangedEventArgs](https://help.ctrader.com/ctrader-algo/references/EventArgs/DateTimePickerValueChangedEventArgs/index.md).

## OldValue

Gets the old selected value.

Environments: Desktop supported · CLI not supported · Cloud not supported.

- CLI: Never raised in the CLI: the events that pass it never fire there (DateTimePicker.ValueChanged).
- Cloud: Never raised in the cloud: the events that pass it never fire there (DateTimePicker.ValueChanged).

C#:

```csharp
public DateTime OldValue {get;}
```

Python:

```python
dateTimePickerValueChangedEventArgs.OldValue: DateTime
```

### Returns

`DateTime` — 

Available since cAlgo.API 5.5.

### Examples

C#:

```csharp
protected override void OnStart()
{
    var dateTimePicker = new DateTimePicker { Value = Server.Time };
    dateTimePicker.ValueChanged += OnDateTimePickerValueChanged;
    Chart.AddControl(dateTimePicker);
}

private void OnDateTimePickerValueChanged(DateTimePickerValueChangedEventArgs args)
{
    var shift = args.NewValue - args.OldValue;
    Print("Previous value: {0}, moved by {1} days", args.OldValue, shift.TotalDays);
}
```

Python:

```python
def on_start(self):
    dateTimePicker = DateTimePicker()
    dateTimePicker.Value = api.Server.Time
    dateTimePicker.ValueChanged += self.on_date_time_picker_value_changed
    api.Chart.AddControl(dateTimePicker)

def on_date_time_picker_value_changed(self, args):
    shift = args.NewValue.Subtract(args.OldValue)
    api.Print(f"Previous value: {args.OldValue}, moved by {shift.TotalDays} days")
```