Functions/Convert-EpochToDateTime.ps1
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function Convert-EpochToDateTime { <# .SYNOPSIS Converts an epoch (Unix) time stamp to System.DateTime. .EXAMPLE $jwt = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpYXQiOjE2MDI2MDMzMDgsIm5iZiI6MTYwMjYwMzAwOCwiZXhwIjoxNjAyNjAzNjA4LCJzdWIiOiJ0b255Lmd1aW1lbGxpQGdtYWlsLmNvbSJ9.nivxCVSg8MtejEndn31natXPZcdjPHrIvV9_NUeXVtU" $deserializedPayload = $jwt | Get-JsonWebTokenPayload Convert-EpochToDateTime -Epoch $deserializedPayload.nbf Convert-EpochToDateTime -Epoch $deserializedPayload.iat Convert-EpochToDateTime -Epoch $deserializedPayload.exp Converts the epoch times in a deserialized JWT payload into DateTime objects. .PARAMETER Epoch The date/time expressed as Unix timestamp. .INPUTS System.Int .OUTPUTS System.DateTime .LINK https://en.wikipedia.org/wiki/Unix_time Get-JsonWebTokenPayload Convert-DateTimeToEpoch #> [CmdletBinding()] [OutputType([System.DateTime])] Param ( [Parameter(Mandatory=$true, ValueFromPipeline=$true, Position=0)][Int]$Epoch ) PROCESS { [nullable[datetime]]$convertedDateTime = $null try { $dt = [DateTime]::new(1970, 1, 1, 0, 0, 0, [DateTimeKind]::Utc) $convertedDateTime = $dt.AddSeconds($Epoch) } catch { Write-Error -Exception ([ArgumentException]::new("Unable to convert incoming value to DateTime.")) -Category InvalidArgument -ErrorAction Stop } return $convertedDateTime } } |