FYI
Have been having a play with the server side example on my raspberry pi 2, armv7 - dart ReleaseXARM, and had an alignment issue, causing a bus error that has now been fixed by the dart team. The alignment is now corrected by the raspberry pi, but it has to do this over 1200 time so it takes 5 seconds to run, compared to 0.5 seconds with a more powerful ReleaseIA32/AMD/Intel.

It was suggested that "Aligning the fields would probably improve performance on Intel, as well."
https://code.google.com/p/dart/issues/detail?id=22384

Thanks you for your code. I might get back to making a simple world clock web/chrome app.