The ASEAN Common Time (ACT) is a proposal to adopt a standard time for all Association of Southeast Asian Nations member states. It was proposed in 1995 by Singapore, and in 2004 and 2015 by Malaysia to make business across countries easier. The proposal failed because of opposition in Thailand and Cambodia: Thais and Cambodians argued that UTC+08:00 was not better than UTC+07:00, which is the current time zone of their countries.
Currently, there are four different time zones used by ASEAN countries. UTC+06:30 (Myanmar); UTC+07:00 (Cambodia, Laos, Thailand, Vietnam, and Western Indonesia); UTC+08:00 (Brunei, Central Indonesia, Malaysia, Philippines, and Singapore); and UTC+09:00 (Eastern Indonesia and Timor-Leste).
