---
id: "T:cAlgo.API.CustomSymbolMarketHours"
kind: "interface"
namespace: "cAlgo.API"
url: "https://help.ctrader.com/ctrader-algo/references/Plugin/Symbol/Custom/CustomSymbolMarketHours/"
---

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

# CustomSymbolMarketHours (interface)

Access to custom symbol's trading sessions schedule.

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

- CLI: Available to plugins only, and plugins cannot run in the CLI.
- Cloud: Available to plugins only, and plugins cannot run in the cloud.

## Definition

```csharp
public interface CustomSymbolMarketHours
```

Available since cAlgo.API 5.3.

## Examples

C#:

```csharp
var customSymbol = CustomSymbols.Add("MYEURUSD", Symbols.GetSymbol("EURUSD"));
var marketHours = customSymbol.MarketHours;
marketHours.Sessions.Clear();
marketHours.Sessions.Add(new CustomSymbolTradingSession(DayOfWeek.Sunday, DayOfWeek.Friday, new TimeSpan(22, 0, 0), new TimeSpan(21, 59, 0)));
marketHours.Holidays.Add(new CustomSymbolTradingHoliday("New Year", new DateTime(2026, 1, 1), new DateTime(2026, 1, 2), true));
```

Python:

```python
from System import DayOfWeek, TimeSpan, DateTime
customSymbol = api.CustomSymbols.Add("MYEURUSD", api.Symbols.GetSymbol("EURUSD"))
marketHours = customSymbol.MarketHours
marketHours.Sessions.Clear()
marketHours.Sessions.Add(CustomSymbolTradingSession(DayOfWeek.Sunday, DayOfWeek.Friday, TimeSpan(22, 0, 0), TimeSpan(21, 59, 0)))
marketHours.Holidays.Add(CustomSymbolTradingHoliday("New Year", DateTime(2026, 1, 1), DateTime(2026, 1, 2), True))
```

## Properties

- `ICollection<CustomSymbolTradingHoliday> Holidays {get;}` — Collection of all symbol's trading holidays [details](https://help.ctrader.com/ctrader-algo/references/Plugin/Symbol/Custom/CustomSymbolMarketHours/Holidays/index.md)
- `ICollection<CustomSymbolTradingSession> Sessions {get;}` — Collection of all symbol's trading sessions [details](https://help.ctrader.com/ctrader-algo/references/Plugin/Symbol/Custom/CustomSymbolMarketHours/Sessions/index.md)