My TOU bills are too high. How can I see when the actual meter reading was taken?

Ok. This is for a bill where we read the TOU register back from the meter and associates it with a certain TOU period in PNPSCADA, to give actual Billing Register readings, even if not at the same instant as the actual Billing Register from the meter, then calculated from a known reading via the Demand Profile and the TOU Calendar entity associated in PNPSCADA.
I put the actual answer to your specific question in Bold, for ease of reference:
To see exactly when a billing register was read from the meter, and exactly what it was, follow these simple steps:

1. From the Home screen
   
2. Select the Meter entity
   
3. In the menu bar of blue links under the banner image, click on the View link. A popup window will open
   
4. In the popup window, click on the 'Meter Registers' link. It should be in bold.
   

In the Meter Registers screen, you will see a lot of timestamps in the column on the very left. And along the top, are the names of the registers, and their units, as they exist in the meter.
Most of these are instantaneous readings we take when we read the meter every day, and we can't use them for billing, because they are not on the half hour boundary. However they are handy for a human to see if the figures on the bill is in the correct ball park, especially when your meter reset date does not coincide with your billing date.
Some of them, however, you would see have a time of 00:00:00.000. These are the ones that are taken into account for billing. They are the billing totals, that gets taken on the 1st for the meters that has been programmed as such. For some of your older meters, you'd get that day falling on the 20th of the month, in your particular case.
These readings are straight as they came from the meter, with the same identifier, and the same unit in the column heading. In PNPSCADA we normally use kWh as the units, for example, but for the SL7000's, the registers actually come back as Wh, not kWh.
Those readings must match up with what you get when you run a Monthly or Provisional Bill, in the description field where it says 'End Reading'. For the Landis & Gyrs, they must also match up with the IEC readout.
I hope that helps!