Get-Date -UFormat %q does not match reference implementation

[brianary]

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest released version
• Search the existing issues.
• Refer to the FAQ.
• Refer to Differences between Windows PowerShell 5.1 and PowerShell.

Steps to reproduce

Get-Date -UFormat %q

This is not currently implemented, but could be added as (dateTime.Month-1)/3+1 or 1+int.DivRem(dateTime.Month-1, 3).Quotient. See Date conversion specifiers or strftime.

Expected behavior

Based on running the `date -d $date +%q` as a reference implementation (see Environment for details).

PS> Get-Date 1999-01-01 -UFormat %q
1
PS> Get-Date 2000-02-14 -UFormat %q
1
PS> Get-Date 2001-03-29 -UFormat %q
1
PS> Get-Date 2002-05-12 -UFormat %q
2
PS> Get-Date 2003-06-25 -UFormat %q
2
PS> Get-Date 2004-08-07 -UFormat %q
3
PS> Get-Date 2005-09-20 -UFormat %q
3
PS> Get-Date 2006-11-03 -UFormat %q
4
PS> Get-Date 2007-12-17 -UFormat %q
4
PS> Get-Date 2009-01-29 -UFormat %q
1
PS> Get-Date 2010-03-14 -UFormat %q
1
PS> Get-Date 2011-04-27 -UFormat %q
2
PS> Get-Date 2012-06-09 -UFormat %q
2
PS> Get-Date 2013-07-23 -UFormat %q
3
PS> Get-Date 2014-09-05 -UFormat %q
3
PS> Get-Date 2015-10-19 -UFormat %q
4
PS> Get-Date 2016-12-01 -UFormat %q
4
PS> Get-Date 2018-01-14 -UFormat %q
1
PS> Get-Date 2019-02-27 -UFormat %q
1
PS> Get-Date 2020-04-11 -UFormat %q
2

Actual behavior

PS> Get-Date 1999-01-01 -UFormat %q
q
PS> Get-Date 2000-02-14 -UFormat %q
q
PS> Get-Date 2001-03-29 -UFormat %q
q
PS> Get-Date 2002-05-12 -UFormat %q
q
PS> Get-Date 2003-06-25 -UFormat %q
q
PS> Get-Date 2004-08-07 -UFormat %q
q
PS> Get-Date 2005-09-20 -UFormat %q
q
PS> Get-Date 2006-11-03 -UFormat %q
q
PS> Get-Date 2007-12-17 -UFormat %q
q
PS> Get-Date 2009-01-29 -UFormat %q
q
PS> Get-Date 2010-03-14 -UFormat %q
q
PS> Get-Date 2011-04-27 -UFormat %q
q
PS> Get-Date 2012-06-09 -UFormat %q
q
PS> Get-Date 2013-07-23 -UFormat %q
q
PS> Get-Date 2014-09-05 -UFormat %q
q
PS> Get-Date 2015-10-19 -UFormat %q
q
PS> Get-Date 2016-12-01 -UFormat %q
q
PS> Get-Date 2018-01-14 -UFormat %q
q
PS> Get-Date 2019-02-27 -UFormat %q
q
PS> Get-Date 2020-04-11 -UFormat %q
q

Error details

No response

Environment data

Name                           Value
----                           -----
PSVersion                      7.4.0
PSEdition                      Core
GitCommitId                    7.4.0
OS                             Microsoft Windows 10.0.22621
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

WSL Ubuntu details:

$ uname -a
Linux localhost 5.15.133.1-microsoft-standard-WSL2 #1 SMP Thu Oct 5 21:02:42 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

Visuals

No response