We have started to introduce Adria to time — specifically to clocks — in a very limited way.
This is not her first experience with time. For years now (hah…amazing that I can say ‘years’ for anything to do with Adria) we have been giving her warnings in increments of minutes. ”In 3 minutes I’m going to let the water out of the tub.” I found long ago that she did much better with transitions when given some kind of warning (often several). When she needs a time estimate that is longer than a few minutes, I give her the numerical value (like “40 minutes”) and then a relational estimate (“about as long as two episodes of Diego”). Other handy units of time: the length of the drive to school, and the length of Finding Nemo. 
She has her sun/moon night light, which is a very basic form of telling time. If the moon is out, it’s near bedtime, and if the sun is out, it’s ok to be out of bed. Unfortunately, we were pretty lax in how we set the ‘moon’ timer on her nightlight, and also on how we enforced it. We discovered when we first got the clock that we didn’t want to be held to the moon, if we decided that she needed to go to bed early. It only took one, “But the moon isn’t out!” before we decided to set the moon time back to like 6pm. Then we could be the ones to say, “Look, the moon is already out!” when we’re trying to get her ready for bed. Unlike the sun, though, the moon wasn’t a hard deadline. Just because the moon is out doesn’t mean that she has to be in bed in the evening, and it never has.
Recently, Amanda got a very nice wall clock for her birthday/Christmas (thanks Tyson and Gamma!):
Little hand on the 8, big hand near the 12...bedtime!
She knows her numbers 1-9 by sight, so she gets it when we tell her that her bedtime is when the little hand is on the 8. She’s got an analytic mind, which I can appreciate, and she kept asking “why?” when we would tell her that it is her bedtime. And I understand…when you can’t tell time, and it’s been dark for 3 hours, bedtime seems so arbitrary. Now there’s something concrete that we can show her every night. It’s been a good thing.
