I found a time machine

A few definitions first.

Time is what the clock says it is according to the director of the United States Naval Observatory where the GPS Master Clock is kept.

A time machine alters the passage of time for objects inside the machine.

Time travel to the future. A clock which shows the time T is synchronized to UTC (T=UTC) and put in the time machine. The machine is set to "future" and some time later the clock is taken out and compared to UTC. Now T<UTC so less time has passed for this clock and from its point of view is now in the future.

It turns out there is a machine that does this. It's the ISS, but as a time machine it's not very useful because it takes a year to travel 0.014 seconds into the future. On the ISS the combined effect of speed and gravity cause time dilation to slow down time.

https://spaceflight.nasa.gov/station/crew/exp7/luletters/lu_letter13.html