Combining the comments above:
you can use wildcard in your monitor stanza, for example:
[monitor:////test/01-1*-2016/test.log] will monitor the directories of October November and December 2016
here is a link to docs: https://docs.splunk.com/Documentation/SplunkCloud/6.5.1612/Data/Specifyinputpathswithwildcards#Input_examples
if you have logs from March and April 17 you will probably need 3 stanzas although you can always set one general and then balcklist or send to null queue the data you dont need.
blacklist explained here: https://docs.splunk.com/Documentation/Splunk/6.5.3/Data/Whitelistorblacklistspecificincomingdata
route and filter data explained here:
http://docs.splunk.com/Documentation/Splunk/latest/Forwarding/Routeandfilterdatad
in this case will just do simple 3 stanzas:
[monitor:////test/01-1*-2016/test.log]
index=test
sourcetype = yourSourcetype
[monitor:////test/01-01-2017/test.log]
index=test
sourcetype = yourSourcetype
[monitor:////test/01-02-2017/test.log]
index=test
sourcetype = yourSourcetype
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