The meeting with British, French and German diplomats was announced by Iran's foreign ministry spokeswoman Marzieh Afkham during a weekly press briefing in Tehran.
The EU, which has chaired the P5+1 talks, said separately that its political director Helga Schmid would also attend.
However, a senior State Department official said there were no plans for the United States to participate in the Istanbul talks which he said were part of the bilateral discussions between Iran and the EU.
Two such deadlines were missed last year and both sides have admitted that big differences remain on the hard detail of what the final pact would look like.
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Afkham told reporters there could be meetings with P5+1 members at a security conference in Munich next month, where Iran's Foreign Minister Mohammad Javad Zarif is already scheduled to meet US Secretary of State John Kerry.
Experts say such measures pushed back the "breakout capacity" to make an atomic weapon, which Iran denies pursuing.
Tehran insists its nuclear programme is for domestic energy production and that it needs to increase its enrichment capacity to make fuel for a fleet of power reactors that it is yet to build.
World powers, however, are skeptical about why Iran needs such a large enrichment capability, and UN atomic inspectors say Tehran has not yet fully addressed questions about past nuclear activities.