Events output timestamps mismatch?

[Y M <snort () outlook com>]

We have a Snort instance that is configured to output both, syslog and unified2. For one particular event, Snort's 
unified2 record was timestamped a day (and couple hours) earlier than the timestamp of the same event output in syslog. 
For example,

Syslog output timestamp is    2014-10-13 04:37 PM
Unified2 output timestamp is  2014-10-12 10:45 AM

The box is reporting the correct date/time. We have a reason to believe that the event actually occurred as reported by 
syslog and not the day earlier, as reported by unified2. All of the events in the unified2 file prior to and after this 
particular event are timestamped properly with 2014-10-13 <time>.  

Did anybody come across something similar? I am going through every possible scenario that could have caused this but 
no luck.

Thanks.

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