Eight o'clock isn't really eight o'clock

My friend told me sport day for 'the over the hill crowd' starts at 8 o'clock.
That start time seemed a bit unusual to me. 
But at eight in the morning I cruised by the empty stadium just to make sure.

Been here long enough that I should discern Thai time.
Their clock has a starting point.. 6 on your dial.

If you are invited to dinner at 2 o'clock, add 2 to six and your dinner should be ready at 8.
I recalculated the starting time of the sport activities: Six plus eight equals 2 PM.

The government sponsored sport event is to promote physical fitness for the older generation.