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Time zone is a region of Earth globe that observes a uniform standard time which usually known as local time. Time zones tend to follow the boundaries of countries longitude and ASEAN countries use four time zones, which are GMT+6.5, GMT+7, GMT+8 and GMT+9. Each of the zones will enlighten different environments from the aspect of socio-ibadah, office operation hours and other times. Although there are lot of ideas in order to unity the ASEAN time zones for the sustainability of ideal economic activities, but a concrete research should be done so that it will harmonizes all parties. Thus, this article tends to enlighten the history of time zones in the world, especially for ASEAN countries. In addition, this article will analyses the changes of prayer time zones in ASEAN countries especially Malaysia if it is switched to GMT+7. This is a qualitative research which uses document analysis method through related texts and materials found. This article focuses on prayer time zones of the most east and most west state in Malaysia. The result shows that the switch of time zone in Malaysia to GMT+7 will leads to one hour late from the actual prayer times. This absalutely will changes the social activities and office operation hours of society in Malaysia. This article indirectly will shows the early picture regarding the effects of switching time zones to GMT+7 so that ASEAN countries especially Malaysia are well prepared. [ABSTRACT FROM AUTHOR]