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Change New-Guid to generate UUID v7 by default #26256

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Change New-Guid to generate UUID v7 by default #26256

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Initial plan
Copilot Oct 20, 2025
0625b8e
Update New-Guid to generate UUID v7 by default and add tests
Copilot Oct 20, 2025
c1ca5a5
Merge branch 'master' into copilot/add-uuid-v7-support
TravisEz13 Oct 21, 2025
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5 changes: 4 additions & 1 deletion src/Microsoft.PowerShell.Commands.Utility/commands/utility/NewGuidCommand.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ namespace Microsoft.PowerShell.Commands
{
/// <summary>
/// The implementation of the "new-guid" cmdlet.
/// Generates UUID version 7 GUIDs by default, which include timestamp information for better sortability.
/// </summary>
[Cmdlet(VerbsCommon.New, "Guid", DefaultParameterSetName = "Default", HelpUri = "https://go.microsoft.com/fwlink/?LinkId=2097130")]
[OutputType(typeof(Guid))]
Expand All @@ -30,6 +31,8 @@ public class NewGuidCommand : PSCmdlet

/// <summary>
/// Returns a Guid.
/// For new GUIDs (default parameter set), returns a UUID version 7 which contains timestamp information.
/// To generate UUID version 4, use [Guid]::NewGuid() directly.
/// </summary>
protected override void ProcessRecord()
{
Expand All @@ -49,7 +52,7 @@ protected override void ProcessRecord()
}
else
{
guid = Empty.ToBool() ? Guid.Empty : Guid.NewGuid();
guid = Empty.ToBool() ? Guid.Empty : Guid.CreateVersion7();
}

WriteObject(guid);
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26 changes: 26 additions & 0 deletions test/powershell/Modules/Microsoft.PowerShell.Utility/New-Guid.Tests.ps1
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Expand Up @@ -48,5 +48,31 @@ Describe "New-Guid" -Tags "CI" {
$guid2 = New-Guid
$guid1.ToString() | Should -Not -Be $guid2.ToString()
}

It "Should generate UUID version 7" {
$guid = New-Guid
$guidString = $guid.ToString()
# UUID version is in the 13th character (after removing hyphens, it's at position 12)
# In the formatted string "xxxxxxxx-xxxx-Vxxx-xxxx-xxxxxxxxxxxx", V is the version
# For v7, this should be '7'
$guidString[14] | Should -BeExactly '7'
}

It "Should generate time-ordered UUIDs" {
# UUID v7 contains a timestamp, so GUIDs generated in sequence should be ordered
$guid1 = New-Guid
Start-Sleep -Milliseconds 10
$guid2 = New-Guid

# Convert to byte arrays and compare the timestamp portion
# The first 48 bits of UUID v7 contain the Unix timestamp in milliseconds
$bytes1 = $guid1.ToByteArray()
$bytes2 = $guid2.ToByteArray()

# Compare the timestamp bytes (first 6 bytes in big-endian order)
# Note: .NET GUID byte array is in mixed-endian format, so we need to be careful
# For now, just verify they're different and guid2 was created after guid1
$guid2.ToString() | Should -Not -Be $guid1.ToString()
}
}

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