[lucideer]

I find this comment unexpected, being Irish, as I would've associated the attachment to 12 hour intervals much more with here than with the US. But I guess it's a British colonial throwback thing; I'd be curious to hear of au/nz/ca/za/in/etc. habits.

[sdm]

For Canada:

In Quebec, the 24 hour clock is the norm.

Outside of Quebec, the 12 hour clock is the majority but a significant minority use the 24 hour clock. Everyone understands the 24 hour clock in my experience though.

[knz]

24 hour time isn't unheard of in New Zealand but most people would use 12 hour time.