If the Polciy is not a renewal of previous Policy or the previous Policy renewed with break, then the Ins. Co. rightly mentioned inceptioned time of covering risk and it is settled law that if starting time for covering the risk is mentioned on the Polciy, every risk cover shall start from the said time.
Well if the Policy was renewed in advance and the Ins. Co. mentioned the time for inception of Policy, then Ins. CO. can not deny its liablity because in case of time renewal, the fresh Polciy is in continuty of previous Policy