In most of the US, including Indiana, Daylight Savings Time takes effect this Sunday. You are supposed to wait until 1AM Sunday (Saturday night), and move your clock forward to 2AM.
The MAARC Sunday Night Net is fixed at 9PM local time, so it will move from 0200UTC to 0100UTC during the DST period. I don't know if other nets are changing.
For more information on Daylight Savings Time, why it doesn't save anything, and why it is fundamentally a stupid idea, see http://standardtime.com.