Fix inconsistent CLI output format for GitCommitDate

[Copilot]

The CLI output format for GitCommitDate was inconsistent between different output methods, making it difficult to parse dates reliably in scripts and automation.

Problem:

• nbgv get-version -v GitCommitDate outputs locale-specific format: 08/10/2025 19:10:07 +00:00
• nbgv get-version -f json outputs ISO 8601 format: "GitCommitDate": "2025-08-10T19:10:07+00:00"

This inconsistency made it challenging to write portable automation scripts that needed to parse commit dates, as the format would vary depending on the system locale and output method used.

Solution:
Modified the individual variable output logic in Program.cs to format DateTimeOffset properties using the ISO 8601 standard ("o" format specifier) to match the JSON output behavior. This ensures all CLI output methods use a consistent, machine-readable date format.

After the fix:

• nbgv get-version -v GitCommitDate: 2025-08-10T19:10:07.0000000+00:00 (ISO 8601)
• nbgv get-version -f json: "GitCommitDate": "2025-08-10T19:10:07+00:00" (ISO 8601)

The change also applies to GitCommitAuthorDate and any other DateTimeOffset properties, while maintaining full compatibility with all other property types.

Fixes #485.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• aka.ms
  • Triggering command: curl -I -sSL --retry 5 --retry-delay 2 --connect-timeout 15 REDACTED (dns block)
• dotnetbuilds.azureedge.net
  • Triggering command: curl --retry 20 --retry-delay 2 --connect-timeout 15 -sSL -f --create-dirs REDACTED (dns block)
  • Triggering command: curl -I -sSL --retry 5 --retry-delay 2 --connect-timeout 15 REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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