OK, I don't know if anyone else has experienced this but I have calls received from between 24 and 48 hours ago reporting on the log as "yesterday", however it also reports calls from now to less than 24 hours ago as the actual number of hours ago...
I actually watched a call received on Monday at 4:25pm on the log turn over to "2 days ago" at 4:25pm today. I looked at it at 4:23pm and it said "yesterday", but I looked at it again at 4:25pm today and it said "2 days ago".
So, tell me, if a call comes in on Monday at 6:35pm, and it's now 6:23pm on Wednesday, shouldn't it say 2 days ago instead? I mean, technically it has to be beyond 48 hours to really be 2 days ago (or more), but common use of the term "yesterday" means anytime before midnight of the previous day, so if someone told me something happened 2 days ago, I would expect that to mean Monday, not Sunday. The use of "yesterday" is therefore misleading since I was looking for a call received yesterday, but was actually viewing calls received the day prior.
Please check your phone logs and click on the oldest of the "yesterday" calls to see if it was more than 24 hours ago, but less than 48. I am running a Moto Droid Verizon 2.1.
This is a strange representation of time in my opinion. How bout you?