Get a file's last modified epoch in batch

epoch.bat

@if (@a==@b) @end /*
@echo off
SetLocal EnableDelayedExpansion

set EPOCH=0
FOR /F "delims=" %%D in ('cscript /nologo /e:jscript "%~f0" "%1"') do (
    set EPOCH=%%D
)
echo Last modified (epoch-seconds): !EPOCH!

goto :eof
*/

var fs = new ActiveXObject("Scripting.FileSystemObject");
var filename = WSH.Arguments(0)
var millis = -1
if (fs.FileExists(filename))
{
    var file = fs.GetFile(filename);
    millis = Date.parse(file.DateLastModified) / 1000;
}
WSH.Echo(millis);