Hello, Below is a section taken from v2024b northamerica file # Rule NAME FROM TO - IN ON AT SAVE LETTER/S Rule Mexico 1931 only - April 30 0:00 1:00 D Rule Mexico 1931 only - Oct 1 0:00 0 S Rule Mexico 1939 only - Feb 5 0:00 1:00 D Rule Mexico 1939 only - Jun 25 0:00 0 S Rule Mexico 1940 only - Dec 9 0:00 1:00 D Rule Mexico 1941 only - Apr 1 0:00 0 S Rule Mexico 1943 only - Dec 16 0:00 1:00 W # War Rule Mexico 1944 only - May 1 0:00 0 S Rule Mexico 1950 only - Feb 12 0:00 1:00 D Rule Mexico 1950 only - Jul 30 0:00 0 S Rule Mexico 1996 2000 - Apr Sun>=1 2:00 1:00 D Rule Mexico 1996 2000 - Oct lastSun 2:00 0 S Rule Mexico 2001 only - May Sun>=1 2:00 1:00 D Rule Mexico 2001 only - Sep lastSun 2:00 0 S Rule Mexico 2002 2022 - Apr Sun>=1 2:00 1:00 D Rule Mexico 2002 2022 - Oct lastSun 2:00 0 S If you look closely, the first rule has the full month name April written and not a three letter short version like the rest of the list. I wonder if that is the new format and not an error. Thanks & Regards, Ertan