While government officials promoting the idea of a single time zone insist that it could improve the country’s economy, critics have said that it would only cause confusion.

Cabinet ministers have touted the proposal for the application of a single time zone in the country’s territory as a way to boost the entire economy, down to village levels.

Previously, Coordinating Economic Minister Hatta Rajasa had claimed that applying a single time zone could bring economic benefits and save the country trillions of rupiah.

The implementation of a single time zone, the same with that of Singapore, the main financial hub in the region, would help improve Indonesia’s economy, he said.

“If we have the same time zone as our neighboring countries, we could save substantially in terms of working hours, traffic and economic activities,” said Hatta.

He claimed that the study on the implementation of a single time zone had actually been started a couple of years ago.

On Wednesday, Hatta said critics should cease debating the pros and cons of the proposal and instead focus on its benefits.

Indonesia is currently divided into three time zones. Provinces in Sumatra and Java, including the capital city of Jakarta, as well as the western part of Kalimantan, have the time zone of Greenwich Mean Time (GMT)+7.

Bali and Sulawesi islands, as well as the West and East Nusa Tenggara provinces, are on GMT+8, while the easternmost part of the country, which includes the four provinces of Maluku, North Maluku, West Papua and Papua, is on GMT+9.

The idea to merge the time zones was first floated late last week by a spokesman for the Committee for the Expansion and Acceleration of Indonesian Economic Growth (KP3EI), Edib Muslim. Hatta is executive chairman of the outfit.

According to Edib, the merging of the three time zones is necessary to improve national productivity. “One hour’s difference between time zones is not effective,” he said.

He gave as an example that trade in Jakarta began at 9 a.m. and ended at 5 p.m., meaning that the effective trading time between the western and eastern zones was only four hours.

He has suggested that Indonesia use the GMT+8 time zone, just like Singapore, Malaysia, and the Philippines. “We chose that because it is already used in the central part of the country,” he said.

With GMT+8, Indonesians living in eastern and central time zones would be able to conduct more business with people in the western region, he said.

“Having just one time zone would make business easier because people living in western, central and eastern regions would have the same standard time,” he said.

Many, however, remain cautious about the proposal.

Religious Affairs Minister Sur-yadharma Ali said that if adopted, a single time zone would change the praying habits of Muslims.

“Actually, there would not be much problem when it comes to praying times. It would just take some time for Muslims to adjust to their new prayer schedules.”

A lawmaker from President Susilo Bambang Yudhoyono’s Democratic Party, Achsanul Qosasi, said the idea would create confusion among the population and could in fact create inefficiency.

He said that creating a single time zone was not a priority.

“We should give priority to other issues that are far more important.”