Use nc:creation_time instead of d:creationdate

[Copilot]

d:creationdate returns an ISO8601 string (1970-01-01T00:00:00+00:00) requiring expensive date parsing. nc:creation_time returns a Unix timestamp (0), which is simpler and more robust to parse.

• Request body (Listing.xml): Request <nc:creation_time /> instead of <d:creationdate />
• Response parser (ResponseParser.swift): Parse Unix timestamp via Date(timeIntervalSince1970:) instead of ISO8601DateFormatter
• Test fixtures: Updated all 26 Body.xml fixtures to use <nc:creation_time>0</nc:creation_time>

// Before
guard let creationString = prop.firstElement(forName: "d:creationdate")?.stringValue,
      let creationDate = ISO8601DateFormatter().date(from: creationString) else { ... }

// After
guard let creationString = prop.firstElement(forName: "nc:creation_time")?.stringValue,
      let creationTimeInterval = TimeInterval(creationString) else { ... }
let creationDate = Date(timeIntervalSince1970: creationTimeInterval)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Use nc:creation_time instead of d:creationdate</issue_title>
<issue_description>## Problem

A PROPFIND to a resource with the <d:creationdate /> returns this specific information:

<d:creationdate>1970-01-01T00:00:00+00:00</d:creationdate>

This is more expensive and fragile to parse.

Goal

Request <nc:creation_time /> instead of <d:creationdate /> which returns this:

<nc:creation_time>0</nc:creation_time>

The value is equal to <d:creationdate>1970-01-01T00:00:00+00:00</d:creationdate>.

Tasks

• Update the server response parsing code
• Update the test fixtures
• Update the test code

References

https://docs.nextcloud.com/server/latest/developer_manual/client_apis/WebDAV/basic.html#supported-properties</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Use nc:creation_time instead of d:creationdate #43

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