---
title: deltaTime
framework: Compute Graph
role: symbol
role_heading: Instance Property
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+]
path: computegraph/computegraphsimulation/advanceparams/deltatime
---

# deltaTime

The time interval, in seconds, to advance the simulation.

## Declaration

```swift
var deltaTime: Float
```

## Discussion

Discussion When mode is ComputeGraphSimulation.SimulationRate.Mode.fixedFrequency or ComputeGraphSimulation.SimulationRate.Mode.fixedTime, the simulation takes between zero and maxSteps fixed-size steps to consume this interval. Any remaining time is accumulated and carried into the next advance.