[int][double]::Parse((Get-Date ($date).touniversaltime() -UFormat %s))
PS C:\> $Date = Get-Date >> [int][double]::Parse((Get-Date ($date).touniversaltime() -UFormat %s)) 1553789149
[int][double]::Parse((Get-Date ($date).touniversaltime() -UFormat %s))
ExamplePS C:\> $Date = Get-Date >> [int][double]::Parse((Get-Date ($date).touniversaltime() -UFormat %s)) 1553789149