You are reaching the limit of 180 API calls/15min for the GET search/tweets query: https://dev.twitter.com/docs/api/1.1/get/search/tweets. If you are using the twitteR packages you can check which limit you have reached with
getCurRateLimitInfo()
EDIT:
Thought about your question again. It'd be easier to tell you if you gave us the error that R throws at you but I think it might have to do with the dates.
The Twitter API used to allow such params but not anymore, you are limited on the past 2 or 4 days of data depending on the availability of the data - Note that the date range does not appear in the list of params for that call (https://dev.twitter.com/docs/api/1.1/get/search/tweets)
Let me know if that helps.