Convert Unix time with PowerShell

Question

I am parsing an SQLite database using the PowerShell SQLite module, and a couple of the return values are created and modified, both of which are in Unix time.

What

Answer 1

See Convert a Unix timestamp to a .NET DateTime.

You can easily reproduce this in PowerShell.

$origin = New-Object -Type DateTime -ArgumentList 1970, 1, 1, 0, 0, 0, 0
$whatIWant = $origin.AddSeconds($unixTime)

Answer 2

Use:

(([System.DateTimeOffset]::FromUnixTimeSeconds($unixTime)).DateTime).ToString("s")

FromUnixTimeMilliseconds is also available.

ToString("s"): Sortable: "The pattern reflects a defined standard (ISO 8601)"

Ref.: Standard Date and Time Format Strings, The Sortable ("s") Format Specifier

Answer 3

$date = get-date "1/1/1970"
$date.AddSeconds($unixTime).ToLocalTime()

Answer 4

$ctime = $entry.created
[datetime]$origin = '1970-01-01 00:00:00'
$origin.AddSeconds($ctime)

Answer 5

Function Convert-FromUnixDate ($UnixDate) {
   [timezone]::CurrentTimeZone.ToLocalTime(([datetime]'1/1/1970').AddSeconds($UnixDate))
}

$niceTime = Convert-FromUnixDate $ctime

PS C:\> $niceTime

Friday, 18 May 2012 8:24:18 p.m.

Answer 6

A simple one-liner:

(Get-Date "1970-01-01 00:00:00.000Z") + ([TimeSpan]::FromSeconds($unixTime))