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@davegreen

davegreen/Timezone.ps1

Last active Sep 26, 2015
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Get and set the computer timezone.
#Requires -Version 3
Function Get-TimezoneFromOffset()
{
<#
.Synopsis
A function that gets the timezones that match a particular offset from UTC
.Parameter UTCOffset
A string containing offset time you require. This must match the form +NN:NN or -NN:NN.
.Example
Get-TimezoneFromOffset -UTCOffset '+08:00'
Get timezones that match the offset of UTC+08:00 (e.g. China, North Asia, Singapore).
.Notes
Author: David Green
#>
[CmdletBinding()]
param([parameter(Position=1,ValueFromPipelineByPropertyName=$True,ValueFromPipeline=$True,HelpMessage='Specify the timezone offset.')]
[ValidateScript({ $_ -match '([\+\-])?[0-1][0-9]:[0,1,3,4][0,5]' })][string]$UTCOffset = '+00:00'
)
$tz = (tzutil /l)
$timezones = @()
if (!($UTCOffset.StartsWith('+') -or $UTCOffset.StartsWith('-')))
{
$UTCOffset = '+' + $UTCOffset
}
foreach ($t in $tz)
{
if (($tz.IndexOf($t) -1) % 3 -eq 0)
{
$ValidUTCOffset = ((($tz[$tz.IndexOf($t) - 1]).Trim() |
Select-String -Pattern "UTC[+-][0-1][0-9]:[0,1,3,4][0,5]|UTC" |
Select-Object -First 1 -ExpandProperty Matches).Value).SubString(3)
if (!$ValidUTCOffset)
{
$ValidUTCOffset = '+00:00'
}
if ($UTCOffset -eq $ValidUTCOffset)
{
$timezone = New-Object -TypeName PSObject
$timezone | Add-Member -MemberType NoteProperty -Name Timezone -Value $t.Trim()
$timezone | Add-Member -MemberType NoteProperty -Name UTCOffset -Value $ValidUTCOffset
$timezone | Add-Member –MemberType NoteProperty –Name ExampleLocation –Value ($tz[$tz.IndexOf($t) - 1]).Trim()
$timezone
break
}
}
}
}
Function Get-Timezone()
{
<#
.Synopsis
A function that retrieves valid computer timezones.
.Example
Get-Timezone
Gets the current computer timezone
.Example
Get-Timezone -Timezone 'Singapore Standard Time'
Get the timezone for Singapore standard time (UTC+08:00).
.Example
Get-Timezone -All
Returns all valid computer timezones from 'tzutil /l'.
.Notes
Author: David Green
#>
[CmdletBinding(DefaultParametersetName='Specific')]
Param([parameter(Position=1,ParameterSetName='Specific',ValueFromPipelineByPropertyName=$True,ValueFromPipeline=$True,HelpMessage='Specify the timezone to set (from "tzutil /l").')]
[ValidateScript(
{
$tz = (tzutil /l)
$validoptions = foreach ($t in $tz)
{
if (($tz.IndexOf($t) -1) % 3 -eq 0)
{
$t.Trim()
}
}
$validoptions -contains $_
})][string]$Timezone = (tzutil /g),
[parameter(Position=2,ParameterSetName='All',HelpMessage='Show all timezones.')][switch]$All
)
Begin
{
$timezones = tzutil /l
}
Process
{
foreach ($t in $timezones)
{
if (($t -match "^$Timezone$") -or (($timezones.IndexOf($t) -1) % 3 -eq 0 -and $All))
{
$race = New-Object –TypeName PSObject
$race | Add-Member –MemberType NoteProperty –Name Timezone –Value $t
if (($timezones[$timezones.IndexOf($t) - 1]).StartsWith('(UTC)'))
{
$race | Add-Member –MemberType NoteProperty –Name UTCOffset –Value '+00:00'
}
elseif (($timezones[$timezones.IndexOf($t) - 1]).Length -gt 10)
{
$race | Add-Member –MemberType NoteProperty -Name UTCOffset –Value ($timezones[$timezones.IndexOf($t) - 1]).SubString(4, 6)
}
$race | Add-Member –MemberType NoteProperty –Name ExampleLocation –Value ($timezones[$timezones.IndexOf($t) - 1]).Trim()
$race
}
}
}
}
Function Set-Timezone()
{
<#
.Synopsis
A function that sets the computer timezone.
.Parameter Timezone
A string containing the display name of the timezone you require. Only valid timezones (from 'tzutil /l') are supported.
.Example
Set-Timezone -Timezone 'Singapore Standard Time'
Set the timezone to Singapore standard time (UTC+08:00).
.Notes
Author: David Green
#>
[CmdletBinding(SupportsShouldProcess=$true,
ConfirmImpact="Low")]
param([parameter(Mandatory=$True,Position=1,ValueFromPipelineByPropertyName=$True,HelpMessage='Specify the timezone to set (from "Get-Timezone -All").')]
[ValidateScript({if (Get-Timezone -Timezone $_){$true}})][string]$Timezone
)
if ((Get-Timezone).Timezone -ne $Timezone -and $PSCmdlet.ShouldProcess($Timezone))
{
Write-Verbose -Message "Setting Timezone to $Timezone"
tzutil.exe /s $Timezone
}
}
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