Overview

• The Chamber of Deputies approved the bill 151–66 with 8 abstentions, sending a proposal to move from UTC-3 to UTC-4 to the Senate.
• If enacted, clocks would be set back 60 minutes nationwide, changing school, work and transport schedules.
• CONICET researcher Patricia Agostino argues UTC-4 better matches Argentina’s biological timing, noting western provinces skew even closer to UTC-5.
• Experts expect short-term effects similar to travel jet lag and warn of initial confusion for preprogrammed timetables, including trains and flights, before routines settle.
• Proponents cite potential energy savings, though international evidence is mixed, and business groups flag coordination risks with Brazil’s UTC-3; the bill also permits a summer switch subject to regional alignment.