The old schedule was as follows; Spring change was first Sunday in April, Fall Change was last Sunday in October. It has been proven that extending DST does NOT save energy...
Matthew Kotchen, an economist at the University of California, saw in Indiana a situation ripe for study.
Prior to 2006 only 15 of the state's 92 counties observed daylight saving time. So when the whole state adopted daylight saving time, it became possible to compare before-and-after energy use. While use of artificial lights dropped, increased air-conditioning use more than offset any energy gains, according to the daylight saving time research Kotchen led for the National Bureau of Economic Research in 2008. That's because the extra hour that daylight saving time adds in the evening is a hotter hour.