If #DST (#DaylightSavingsTime) is good, countries like #China (1986–1992), #Japan (1948–1951), and #Korea (South: 1948–1951; 1955–1960; 1987–1988) would've kept on using it. They're doing perfectly fine without it.
My country, the #Philippines, used DST multiple times in its history (1936–1937; 1954; 1978; 1990). The last time was mainly to conserve energy, and abandoned it after the energy crisis was solved.
To countries still using DST, make up your mind. Either stay in Standard Time or permanent Daylight Time. It's good for you and everyone else. ^_~