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Get-Date -UFormat "%V" returns wrong weeknumber #11534

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@paalbra

Description

@paalbra
Issue body actions

Steps to reproduce

$date = Get-Date "2019-12-25"
while ($date -lt (Get-Date "2020-01-09")){
    Get-Date $date -UFormat '%Y-%m-%d : %V'
    $date = $date.AddDays(1)
}

Expected behavior

2019-12-25 : 52
2019-12-26 : 52
2019-12-27 : 52
2019-12-28 : 52
2019-12-29 : 52
2019-12-30 : 01
2019-12-31 : 01
2020-01-01 : 01
2020-01-02 : 01
2020-01-03 : 01
2020-01-04 : 01
2020-01-05 : 01
2020-01-06 : 02
2020-01-07 : 02
2020-01-08 : 02
2020-01-09 : 02

Actual behavior

Week number of 2020-01-03 is wrong (and other dates that trigger the same issue)

2019-12-25 : 52
2019-12-26 : 52
2019-12-27 : 52
2019-12-28 : 52
2019-12-29 : 52
2019-12-30 : 01
2019-12-31 : 01
2020-01-01 : 01
2020-01-02 : 01
2020-01-03 : 53
2020-01-04 : 01
2020-01-05 : 01
2020-01-06 : 02
2020-01-07 : 02
2020-01-08 : 02
2020-01-09 : 02

Environment data

Built of master:

PS /> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      7.0.0-preview.6
PSEdition                      Core
GitCommitId                    7.0.0-preview.6-109-gb19e2b9d4cb65d9b705f457317d1803dea6eb150
OS                             Linux 5.4.7-200.fc31.x86_64 #1 SMP Tue Dec 31 22:25:12 UTC 2019
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0
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    Issue-Questionideally support can be provided via other mechanisms, but sometimes folks do open an issue to get aideally support can be provided via other mechanisms, but sometimes folks do open an issue to get aResolution-FixedThe issue is fixed.The issue is fixed.WG-Cmdlets-Utilitycmdlets in the Microsoft.PowerShell.Utility modulecmdlets in the Microsoft.PowerShell.Utility module

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