Este es un ejemplo del cambio del 2009 para la Ciudad Autónoma de Buenos Aires y las provincias argentinas que adhirieron al mismo cambio de hora
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\Argentina Standard Time] "Display"="(GMT-03:00) Buenos Aires" "Dlt"="Argentina Daylight Time" "TZI"=hex:b4,00,00,00,00,00,00,00,c4,ff,ff,ff,00,00,03,00,00,00,03,00,00,00,00,00,00,00,00,00,00,00,0a,00,06,00,03,00,17,00,3b,00,3b,00,00,00 "Std"="Argentina Standard Time" "Index"=dword:8000004c [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\Argentina Standard Time\Dynamic DST] "FirstEntry"=dword:000007d6 "LastEntry"=dword:000007d9 "2007"=hex:b4,00,00,00,00,00,00,00,c4,ff,ff,ff,00,00,01,00,01,00,01,00,00,00,00,00,00,00,00,00,00,00,0c,00,00,00,05,00,00,00,00,00,00,00,00,00 "2006"=hex:b4,00,00,00,00,00,00,00,c4,ff,ff,ff,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00 "2008"=hex:b4,00,00,00,00,00,00,00,c4,ff,ff,ff,00,00,03,00,00,00,03,00,00,00,00,00,00,00,00,00,00,00,0a,00,06,00,03,00,17,00,3b,00,3b,00,00,00 "2009"=hex:b4,00,00,00,00,00,00,00,c4,ff,ff,ff,00,00,03,00,00,00,03,00,00,00,00,00,00,00,00,00,00,00,0a,00,00,00,03,00,00,00,00,00,00,00,00,00 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\SA Eastern Standard Time] "Display"="(GMT-03:00) Georgetown"