Is there a clock in my Electric meter?

[..h]

According to my electricity supplier, I'm supposed to use my heavy appliances (washer/dryer/dishwasher/a/c) mostly at night for several reasons. One, touting it is in my best interest, is that electric rates are much cheaper at night.
I went out and looked at my standard elec meter. It basically has a wheel and a "odometer."
When the bill comes, it is just "last month minus this month," separated by several rate tables times the rate and summed up.
Looking at this, I can not figure out how the heck they can tell how much electricty I use during peak times vs. how much I use aduring the lower night-time rates.
I considered a clock in the meter itself, somehow, which might "slow" down the wheel that clicks off the odometer, but that would be a "discount" taken at the meter itself vs. the power company actually having a night-time usage number to multiply by the lower rate.
How does the meter-reading-man tell, when looking at my meter how much of the electricity used was at any specific time or usage rate period?

..h