---
title: domainLookupStartDate
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/urlsessiontasktransactionmetrics/domainlookupstartdate
---

# domainLookupStartDate

The time immediately before the task started the name lookup for the resource.

## Declaration

```swift
var domainLookupStartDate: Date? { get }
```

## Discussion

Discussion This value will be nil if a persistent connection was used, or if the resource was retrieved from local resources.

## See Also

### Accessing temporal metrics

- [fetchStartDate](foundation/urlsessiontasktransactionmetrics/fetchstartdate.md)
- [domainLookupEndDate](foundation/urlsessiontasktransactionmetrics/domainlookupenddate.md)
- [connectStartDate](foundation/urlsessiontasktransactionmetrics/connectstartdate.md)
- [secureConnectionStartDate](foundation/urlsessiontasktransactionmetrics/secureconnectionstartdate.md)
- [secureConnectionEndDate](foundation/urlsessiontasktransactionmetrics/secureconnectionenddate.md)
- [connectEndDate](foundation/urlsessiontasktransactionmetrics/connectenddate.md)
- [requestStartDate](foundation/urlsessiontasktransactionmetrics/requeststartdate.md)
- [requestEndDate](foundation/urlsessiontasktransactionmetrics/requestenddate.md)
- [responseStartDate](foundation/urlsessiontasktransactionmetrics/responsestartdate.md)
- [responseEndDate](foundation/urlsessiontasktransactionmetrics/responseenddate.md)