Last date of export against advance licence

This query is in reference to the Advance Licence which was issued to us on 09th September 2015. As per the condition of this Advance Licence, first we have to import and then export to discharge its export obligation within the time frame of 90 days from the date of filing Import Bill of entry. Since it is the new business thus we had very few orders of export resulted that we could not use the advance licence for the complete first year till 9th September 2016. Therefore we applied for the extension of this Advance Licence for another six month till 08th March 2017 and was allowed too by DGFT. Now considering the future forecast of export orders, we had imported with the quantity of 50 MT and filed its Bill of entry on 16th January 2017. Hence kindly advise us THE LAST DATE OF EXPORT, wherein we can discharge our export obligation, as the last date of this Advance Licence is 08th March 2017 after the above said extension.