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

# XblAchievementTimeWindow

> 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](/reference/live/xsapi-c/achievements_c/structs/xblachievement)

## Requirements

**Header:** achievements\_c.h

## See also

[achievements\_c](/reference/live/xsapi-c/achievements_c/achievements_c_members)


## Related topics

- [XblAchievement](/reference/live/xsapi-c/achievements_c/structs/xblachievement.md)
- [Overview of event-based Achievements](/services/xbox-services/player-data/achievements/event-based/live-achievements-eb-overview.md)
- [XblAchievementProgression](/reference/live/xsapi-c/achievements_c/structs/xblachievementprogression.md)
- [XblAchievementType](/reference/live/xsapi-c/achievements_c/enums/xblachievementtype.md)
- [XblAchievementOrderBy](/reference/live/xsapi-c/achievements_c/enums/xblachievementorderby.md)