---
title: "readAttributeEpochUs(completionHandler:)"
framework: matter
role: symbol
role_heading: Instance Method
path: "matter/mtrbaseclustertestcluster/readattributeepochus(completionhandler:)"
---

# readAttributeEpochUs(completionHandler:)

## Declaration

```swift
func readAttributeEpochUs(completionHandler: @escaping @Sendable (NSNumber?, (any Error)?) -> Void)
```

```swift
func readAttributeEpochUs() async throws -> NSNumber
```