SHAFAQNA – The Grand Ayatollah Sistani answered a question about Laylatul Qadr.
Question: Considering that the date of Laylatul Qadr in Iran and other countries are not the same, is the real night in Iran or other countries?
The Grand Ayatollah Sistani: Each (country) act on own religious duties according to the proof of the moon for the month in their own area.
Source: PERSIAN SHAFAQNA