If Splunk is running in the that locale, then I would expect this %b conversion to work. What does the command
# date +'%b'
show for you, in the environment in which splunk is used?
UPDATE: We don't have locale handling in our date parsing at all, currently. I had somehow imagined that we made use of the system library for the specific string decoding, but apparently it is a custom implementation for cross-platform consistency, existence at all on windows, and performance goals.
Essentially this becomes an enhancement request (although a fairly important one) for handling localized european dates. In Asia this hasn't come up (yet) because mostly numerics are used for months, rather than names.
The only short-term workarounds I can recommend are to pre-process the file, or to alter the date format in which it is emitted. Obviously neither is ideal but it's what's possible today.
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