Public/ConvertTo-WindowsTimeZone.ps1
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function ConvertTo-WindowsTimeZone { <# .SYNOPSIS Takes an IANA time zone and converts it to a Windows time zone. .DESCRIPTION IANA time zones are returned by most web endpoints. We can translate any given IANA time zone (e.g. America/New_York) into a proper Windows time zone (e.g. Eastern Standard Time). This function leverages the unicode.org windowsZones.xml file to translate IANA to Windows time zones. .EXAMPLE ConvertTo-WindowsTimeZone 'America/New_York' Returns the Windows time zone 'Eastern Standard Time' .EXAMPLE ConvertTo-WindowsTimeZone Returns the Windows time zone based on the public IP address. .PARAMETER IANATimeZone IANA time zone string. Reference: https://en.wikipedia.org/wiki/List_of_tz_database_time_zones #> [CmdletBinding()] param ( [string]$IANATimeZone = (Get-IANATimeZone) ) try { $url = "https://raw.githubusercontent.com/unicode-org/cldr/master/common/supplemental/windowsZones.xml" [xml]$xml = (Invoke-WebRequest -Uri $url -ContentType 'application/xml').Content } catch { throw "Failed to obtain time zone XML map from GitHub: $_" } $zones = $xml.supplementalData.windowsZones.mapTimezones.mapZone | Where-Object territory -Match 001 $win_tz = ($zones | Where-Object type -Match $IANATimeZone).other Write-Verbose "IANA Time Zone ($IANATimeZone) = Windows Time Zone ($win_tz)" return $win_tz } |