> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# XblAchievementTimeWindow

> XblAchievementTimeWindow

Represents an interval of time during which an achievement can be unlocked.

## Syntax

```cpp theme={null}
typedef struct XblAchievementTimeWindow {  
    time_t startDate;  
    time_t endDate;  
} XblAchievementTimeWindow  
```

### Members

*startDate*\
Type: time\_t

The start date and time of the achievement time window.

*endDate*\
Type: time\_t

The end date and time of the achievement time window.

## Remarks

This class is only used when the achievement\_type enumeration is set to challenge.

## Member of

[XblAchievement](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/structs/xblachievement.md)

## Requirements

**Header:** achievements\_c.h

## See also

[achievements\_c](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/achievements_c_members.md)


## Related topics

- [achievements_c (contents)](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/achievements_c_members.md)
- [XblAchievement](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/structs/xblachievement.md)
- [Achievements](https://docs.xbox.com/services/xbox-services/player-data/achievements/index.md)
- [Achievement (JSON)](https://docs.xbox.com/reference/live/rest/json/json-achievementv2.md)
- [XblAchievementProgression](https://docs.xbox.com/reference/live/xsapi-c/achievements_c/structs/xblachievementprogression.md)