Each Arrow object has a `shift` method, which is how you can add or subtract units of time. Greater/less/equal comparisons work exactly as you'd expect them to.
A former coworker accidentally bought one of these on Craigslist thinking he was buying a legit one. The price was pretty close to retail (or maybe even higher, as it was close to the X launch). The seller even let him handle one that "had already been opened", which was likely a legit one and then what he ultimately bought was a sealed fake.