Poll: Early or late?

The two Davids have had a dispute on an issue of critical importance and require your assistance. Please reply with your answer to the following question:

If the actual time is 10:00 PM and the clock in your bus to Mendoza says it is 9:30 PM, is time on the clock 1/2 an hour early or 1/2 an hour late?

Results will be posted in 48 hours (give or take).

Gracias,

Los Davides