# `GSLayer.lastUpdate`

*Instance Property*

The time of the most recent geometry invalidation.

## Declaration

```swift
var lastUpdate: TimeInterval { get set }
```

```objc
@property NSTimeInterval lastUpdate;
```

```python
lastUpdate() -> float
setLastUpdate_(lastUpdate: float)
```

## Discussion

The value uses the Core Foundation absolute time reference date.

## See Also

### Update State

- [`GSLayer.lastOperation`](/Core/GlyphsCore/GSLayer/lastOperation) — The most recent update affecting the layer or its referenced content.
- [`GSLayer lastOperation:`](/Core/GlyphsCore/GSLayer/lastOperation:) — The most recent update affecting the layer or its referenced content, while avoiding component cycles.
- [`GSLayer.upToDate`](/Core/GlyphsCore/GSLayer/upToDate) — Whether derived representations are newer than changes that affect the layer.
- [`GSLayer.isUpdatingMetrics`](/Core/GlyphsCore/GSLayer/isUpdatingMetrics) — Whether the layer is currently updating its side bearings.
- [`GSLayer.content`](/Core/GlyphsCore/GSLayer/content) — A KVO dependency key for changes to any content of the layer.