Did you remove all of configuration from datetime.xml? Why don't you copy datetime.xml from /etc to your directory?
I got the same situation and I resolved that like below.
copy datetime.xml to specific directory.
cp -p /home/splunk/etc/datetime.xml /home/splunk/etc/system/local/my_datetime.xml
configure props.conf
[mysourcetype]
DATETIME_CONFIG = /etc/system/local/my_datetime.xml
...
Put your datetime configuration to my_datetime.xml (I didn't remove anything from my_datetime.xml)
restart Splunk and monitor file
At that moment,I saw my test file name of ADESS_FANALL_01082014_01172014_195441.csv was indexed with expected timestamp. (14/01/08 xx:xx:xx.xxx)
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