Whenever you have a true DateTime (and not a string, for example), you have plenty of powerful ways to format. You can get DateTime objects directly:

 
PS> $installDate = (Get-CimInstance -Class Win32_OperatingSystem).InstallDate

PS> $installDate.GetType().FullName
System.DateTime 
 

Or you can convert a string to a DateTime:

 
PS> $psconf = Get-Date -Date '2019-06-04 09:00'

PS> $psconf.GetType().FullName
System.DateTime 
 

Once you have a DateTime object, use the ToString() method and supply one or two arguments.

The first argument determines which parts of the date you want to see, and uses these (case-sensitive!) placeholders:

y       Year
M       Month
d       Day
H       Hour
m       Minute
s       Second
f       Millisecond

The more placeholders you specify, the more detail you get:

 
PS> (Get-Date).ToString('dd')
30

PS> (Get-Date).ToString('ddd')
So

PS> (Get-Date).ToString('dddd')
Sonntag

PS> 
 

(as you can see, PowerShell uses your default language which was German in this example)

To output a DateTime in ISO format, try this:

 
PS> $installDate = (Get-CimInstance -Class Win32_OperatingSystem).InstallDate

PS> $installDate.ToString('yyyy-MM-dd HH:mm:ss')
2018-06-08 18:24:46

PS>  
 

If you’d like to also specify the locale (language), specify a CultureInfo as second parameter:

PS> (Get-Date).ToString('dddd', [System.Globalization.CultureInfo]'en-us')
Sunday

PS> (Get-Date).ToString('dddd', [System.Globalization.CultureInfo]'zh')
星期日

PS> (Get-Date).ToString('dddd', [System.Globalization.CultureInfo]'es')
domingo

PS> (Get-Date).ToString('dddd', [System.Globalization.CultureInfo]'fr')
dimanche

PS>  
 

If you’re wondering what the culture identifier is for a given culture, try this:

 
PS> [System.Globalization.CultureInfo]::GetCultures('Installed') | Out-GridView -PassThru 
 

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