Overview

• The bill, authored by Julio Cobos, sets UTC-4 in winter with a possible summer return to UTC-3, leaving the switch dates to the Executive if it becomes law.
• Deputies approved the measure by 151 votes to 66 with 8 abstentions, reviving a push that stalled in 2022 and 2024.
• Meteorological and chronobiology experts say most of Argentina aligns geographically with UTC-4, with far‑western provinces closer to UTC-5, and the change would also match several neighbors’ clocks.
• Sleep and circadian specialists expect earlier morning light for schools and workers and improved alertness, while warning that seasonal clock changes can cause short‑term sleep disruption and higher risks of accidents and cardiovascular events.
• Projected energy savings are uncertain, as past shifts delivered little benefit and one study by Diego Golombek found a slight increase in electricity consumption during previous changes.