Log rotation problem

We are running WLS 8.1.4 and have had a recurring problem with log rotation for quite a long time. It has happened on every machine we've used, running both Windows 2000 and XP. What we want to do is have our logs roll nightly, but it seems that no matter what time we set in the WLS console, the log ends up rolled at an arbitrary time.
Our current configuration is the following:
Server File Name: ourServerName_%MM%-%dd%-%yyyy%.log
Rotation Type: By Time
Rotation Time: 04:00
File Time Span: 24 Hrs
We have tried many permutations on the Rotation Time field, including removing or adding leading zeros as well as seeing if the time difference is constant due to a time zone issue, but no discernible pattern has emerged.
For instance, the logs for the last few days have been rolled at exactly 2300, despite being set to roll at 0400. Other times it has been set to roll at 0204, and it will roll at 1104. One other thing to note: the minutes are always correct, but the hours are nearly always off.
Any ideas?

No, and I can verify that this problem has showed up at multiple sites configured by multiple people besides myself. As we are precisely following the specs laid out in the WLS 8.1 docs, I can only assume this is a bug.

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