Overview

• After a marathon session, the Chamber of Deputies approved the bill 151–66 with 8 abstentions and forwarded it to the Senate.
• The proposal designates UTC-4 as the official winter time, requiring clocks to be set back one hour nationwide, which would move sunrises and sunsets earlier and alter school, work and public-service schedules.
• The text empowers the Executive to return to UTC-3 during the summer and, per the draft, sets fixed switch dates on the first Sundays of April (to UTC-4) and September (back to UTC-3).
• Backers led by deputy Julio Cobos argue the change would curb electricity use and improve student alertness by better aligning schedules with daylight; they cite CONICET-linked research on energy and circadian benefits.
• Cronobiologists and other experts contest the health and savings claims, warning that seasonal clock shifts can disrupt sleep and raise short-term accident risks as the Senate prepares to debate the measure.