Singapore Exchange (SGX) announces that the securities market will start continuous trading at 1230 hrs on 3rd December 2014, with the pre-open routine at 1200 hrs. This delayed opening is to enable member firms to complete client position reconciliations, and rectify any errors in the end-of-day processing for 1st December 2014 on the securities client-accounting system hosted by SGX on behalf of member firms. The market will remain open till 1700 hrs and close as per normal. The problem was caused by a software defect which has since been rectified.
Source：http://www.sgx.com/wps/wcm/connect/sgx_en/home/higlights/news_releases/SGX+announces+delayed+market+open+for+its+securities+market+on+3rd+December