Hello Ajay,
That is not actually a problem from splunk end. You don't have enough data to tell splunk which date to take so automatically it takes the current system date from where you do the data upload. in your case timerange picker also should work fine if you can show it on a monthly basis. The query has to be formed likewise.
Regarding the lookup what exactly would you match up? If you do the lookup on the splunk query timerange picker will not have any effect as it looks for the splunk events rather than the non-existing data which is formed after the query is triggered. To have a the trend it will be better if you can have the same included in your csv file rather than going for lookup implementation which is quite expensive on maintenance and configuration.
Thanks,
L
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