runscope file age test

var filedate = moment(response.headers["Last-Modified"]);
var now = moment().subtract(1000, 'seconds');
assert(filedate.isBefore(now), "file is > 1000 seconds old");

This doesn't seem to work either - always asserts that the file is old.

var filedate = moment(response.headers["Last-Modified"]);
var now = moment();
assert(filedate.isBefore(now.subtract(100000, 'seconds')), "file is > 100000 seconds old");