In a statement received Friday, the Indonesian Stock Exchange (IDX) in Jakarta said from January 2 it would begin trading half an hour earlier, opening at 9 am (0200 GMT), while closing at 4 pm as usual.

"This is in order to synchronise trading times with other bourses in the region and provide additional time for investors in central and eastern Indonesia," the statement said.

The exchange will also bring forward its 10-minute pre-opening session to 8:45 am.

The announcement comes after a proposal was scrapped to reduce the sprawling archipelago's time zones from three to one in order to expand trade opportunities.