SPO Region

# https://techcommunity.microsoft.com/t5/Office-365-Groups/Time-Zone-Settings-for-O365-Groups-SharePoint-Site/td-p/26301
# https://blogs.technet.microsoft.com/heyscriptingguy/2014/04/24/create-and-manage-sharepoint-online-sites-by-using-powershell/
# Requires https://www.microsoft.com/en-ie/download/details.aspx?id=35585 to run
#Links to investigate


$TimezoneValue= "(GMT) Greenwich Mean Time: Dublin, Edinburgh, Lisbon, London"
$localeid = 2057

$AuthStore = "\\fcitapps\ProgramStore\UserCreation\Credentials\" + $env:USERNAME
$Auth = Get-Content $AuthStore | ConvertTo-SecureString
$O365Username = $env:USERNAME + "@domain.com"
$LocalUsername = "DOMAIN\" + $env:USERNAME

#Create a credential with your username and retrieved password.
$O365Cred = New-Object System.Management.Automation.PsCredential($O365Username, $Auth)
$LocalCred = New-Object System.Management.Automation.PsCredential($LocalUsername, $Auth)

#Generate a new Office 365 Powershell session.
$s2=New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell/ -Credential $O365Cred -Authentication Basic -AllowRedirection
Import-PSSession -Session $s2

#Load the Sharepoint prerequisites
Add-Type -Path ([System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client").location)
Add-Type -Path ([System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint.Client.runtime").location)

#Create credentials for connecting to Sharepoint sites
$SPOUsername = "globaladmin@domain.com"
$SPOPassword = Read-Host -Prompt "Enter password for $SPOUsername" -AsSecureString
$Creds = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($SPOUsername,$SPOPassword)

#Load all the Sharepoint groups
$Groups =Get-UnifiedGroup |Where-Object {$_.SharePointSiteUrl -ne $null}|select SharePointSiteUrl

foreach($Group in $Groups.SharePointSiteUrl)
{
Write-Host $Group

$Site = $Group
$Context = New-Object Microsoft.SharePoint.Client.ClientContext($Site)
$Context.Credentials = $Creds




$TimeZones = $Context.Web.RegionalSettings.TimeZones

Try{
$Context.Load($TimeZones)
$Context.ExecuteQuery()
$RegionalSettings = $Context.Web.RegionalSettings
$Context.Load($RegionalSettings)
$Context.ExecuteQuery()
Write-Host $RegionalSettings.LocaleID
Try{
$TimeZone = $TimeZones | Where {$_.Description -eq $TimezoneValue}
$RegionalSettings.TimeZone = $TimeZone
$RegionalSettings.Localeid = $localeid
$Context.Web.Update()
$Context.ExecuteQuery()
Write-Host "Changed"
}
Catch{
Write-Host $Error[0] -ForegroundColor Red
Write-Host "Unable to modify"
}

}
Catch{
Write-Host "Unauthorised" -ForegroundColor Red
}


Write-Host "----------"

}

Get-PSSession | Remove-PSSession