The Philippines shares the same time zone with China, Taiwan, Hong Kong, Macau, Malaysia, Singapore, Western Australia, Brunei, Irkutsk (Russia), Central Indonesia, and most of Mongolia.This change meant that the International Date Line moved from going west of the Philippines to go on the east side of the country, which had to follow the eastern hemisphere to align itself with the rest of Asia.[8][9] In order to promote synchronicity with official time, on May 15, 2013, President Benigno Aquino III signed Republic Act No.10535 setting the Philippine Standard Time,[10] requiring all government offices and media networks to synchronize their timepieces with PAGASA's rubidium atomic clock.[11][12] Since 1990, the Philippines has not observed daylight saving time, although it was in use for short periods during the presidency of Manuel L. Quezon in 1936ā1937, Ramon Magsaysay in 1954, Ferdinand Marcos Sr. in 1978, and Corazon Aquino in 1990.