Surprisingly late. Colin's been able to read a digital clock for a couple of years now (he's 6y2m now), I'd say, but it's not something he's ever been particularly interested in, and I have definitely not encouraged interest because it was convenient to be able to say it was bedtime whenever I felt like it! (And we're fortunate in having very un-clock-driven lives, so it didn't come up much.) Around the time he started school I realised I should buy him an analogue clock as we had none in the house! He still isn't totally utterly secure with analogue time, and dislikes time questions on maths sheets (though if he concentrates he can do them now). Curiously, about the only thing *I* remember from school maths before about the age of 8 is how much I hated clock questions. Nature or nurture? His teacher, interestingly, was very unsurprised.
