Local/Convert-UTC.ps1
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function Convert-UTC { Param ( [Parameter(Position=0,Mandatory=$true,ValueFromPipeline=$True)] [string]$ctime, [switch]$gmt ) Begin { Write-Verbose "Converting UTC time" #define universal starting time [datetime]$utc = "1/1/1970" #test for Daylight Saving Time Write-Verbose "Checking DaylightSavingTime" $dst = Get-Ciminstance -ClassName Win32_Computersystem -filter "DaylightInEffect = 'True'" } Process { Write-Verbose "Processing $ctime" #add the ctime value which should be the number of #seconds since 1/1/1970. $gmtTime = $utc.AddSeconds($ctime) if ($gmt) { #display default time which should be GMT if #user used -GMT parameter Write-verbose "GMT" return $gmtTime } else { #otherwise convert to the local time zone Write-Verbose "Converting to $gmtTime to local time zone" #get time zone information from WMI $tz = Get-CimInstance -ClassName Win32_TimeZone #the bias is the number of minutes offset from GMT Write-Verbose "Timezone offset = $($tz.Bias)" #Add the necessary number of minutes to convert #to the local time. $local = $gmtTime.AddMinutes($tz.bias) if ($dst) { Write-Verbose "DST in effect with bias = $($tz.daylightbias)" return $local.AddMinutes(-($tz.DaylightBias)) } else { #write the local time return $local } } } End { Write-Verbose "Convert-UTC completed" } } |