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function Get-EpochTimeInSeconds
{
    param
    (
        [DateTime] $DateTime
    )
    
    if ($DateTime)
    {
        ([DateTimeOFfset]$Date).ToUnixTimeSeconds()
    }
    else
    {
        [DateTimeOffset]::Now.ToUnixTimeSeconds()
    }
}

function Get-EpochTimeFrom {
    param (
        [int]$Seconds
    )

    (Get-Date -Date '01-01-1970') + ([System.TimeSpan]::FromSeconds($Seconds))
}