将IST转换为英国时间

Question

如何将分钟和秒钟中的时间字符串转换为英国时间： -

    $crlExt = New-Object -ComObject X509Enrollment.CX509Extension
    $crlOid = New-Object -ComObject X509Enrollment.CObjectId
    $crlOid.InitializeFromValue('2.5.29.31')
    $crlValue = [Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes('http://www.test.com'))
    $crlExt.Initialize($crlOid, 0x1, $crlValue)
    $crlExt.Critical = $false

我循环时没有得到结果

请帮助