Speaking to reporters, he said Iran is determined to clinch a deal in line with the country's redlines and criteria.
Negotiations are proceeding and some differences have been removed and new common points of views have been created which would serve as a basis to clinch the final deal but there are still some differences, he said.
Remaining issues could have been resolved in this round of talks, he said adding that the two sides felt they needed more time and to the same reason postponed the meeting for coming days.
All problems could be resolved but it is quite natural that the coming days or weeks will be very tough as taking final step is always somewhat difficult, he said.
It is quite natural that negotiations never satisfy both sides completely as each side should mind their own redlines, he said.
Clinching a general deal is easy but when coming into details it will be a very tough and complicated job and there will be many problems on the way, said President Rouhani.
Assuming a win-lose game at the contemporary world is wrong and no power in the world could be the absolute winner or think of annihilation of the other party or trampling upon rights of others, he said.
He expressed the hope that nuclear talks would bear fruit and bring blessings for Iranian people, the regional states and the entire world.
President Rouhani said that the nuclear deal will serve international peace, friendship, close relations and economic development of Iran and the regional countries.