When an AP reboots, they report their time like that. There is no battery for the clock, so when they power off, they "forget" the time and the first log message or two will be their factory default time. As soon as they sync with a controller, they update their time, though.
I would open a TAC case on this. The message below is the culprit:
Reboot Information
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AP rebooted Mon Jul 23 01:21:56 UTC 2012; Process /usr/sbin/dnsmasq has too many open files (770)
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TAC may be able to get the crash information from the AP and open a bug (or add your case to an existing bug to get it fixed quicker).