>I now see, though, that it doesn't seem to be working quite right. I selected Go Back One Day and it seems to be displaying all messages since 12:01 a.m. yesterday. Didn't it used to go back 24 hours, to the same time of day?

The One day, Two days, One week and Two weeks were bound to the startup of the day. I have adjusted them to be in time instead to be consistent with the rest of those options. Thanks for letting me know.