Eu suspeito que isso possa ter algo a ver com isso:
Summer time start and end dates 2007-2016
Year begins ends
2007 30 March 16 September
2008 28 March 5 October
2009 27 March 27 September
2010 26 March 12 September
2011 1 April 2 October
2012 30 March 23 September
2013 29 March 8 September
2014 28 March 28 September
2015 27 March 20 September
2016 1 April 9 October
"No passado, a imprevisibilidade do DST em Israel tornou-se frustrante o suficiente para que o Microsoft Windows parasse de tentar rastrear mudanças e apenas tornasse o tempo de Israel o horário de Greenwich mais duas horas (e desativasse a opção de horário de verão) Isso levou a várias soluções ad hoc para o problema nos sistemas Windows e em outros softwares da Microsoft (por exemplo, as entradas de calendário do Outlook geralmente são desativadas por uma hora quando compartilhadas, devido à falta de suporte DST). uma atualização que tenha o horário de verão ativado para Israel.No entanto, a data da transição de volta para a hora padrão é definida como o segundo domingo de setembro, independentemente da data do calendário hebraico. [2] O Windows 7 contém tempos de horário de verão corretos até 2023 , mas nem todo software faz uso desta informação extra. "
Aqui está o que mostro em minhas máquinas com Windows 7/2008 R2 para Israel. Você pode querer comparar isso com o seu.
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\Israel Standard Time]
"MUI_Display"="@tzres.dll,-370"
"MUI_Dlt"="@tzres.dll,-371"
"MUI_Std"="@tzres.dll,-372"
"Display"="(UTC+02:00) Jerusalem"
"Dlt"="Jerusalem Daylight Time"
"Std"="Jerusalem Standard Time"
"TZI"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,0a,00,00,00,01,00,02,00,00,\
00,00,00,00,00,00,00,04,00,05,00,01,00,02,00,00,00,00,00,00,00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\Israel Standard Time\Dynamic DST]
"FirstEntry"=dword:000007d4
"LastEntry"=dword:000007e7
"2004"=hex:88,ff,ff,ff,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
"2005"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,0a,00,00,00,02,00,02,00,\
00,00,00,00,00,00,00,00,04,00,05,00,01,00,02,00,00,00,00,00,00,00
"2006"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,0a,00,00,00,01,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2007"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,09,00,00,00,03,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2008"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,0a,00,00,00,01,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2009"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,09,00,00,00,05,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2010"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,09,00,00,00,02,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2011"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,0a,00,00,00,01,00,02,00,\
00,00,00,00,00,00,00,00,04,00,05,00,01,00,02,00,00,00,00,00,00,00
"2012"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,09,00,00,00,04,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2013"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,09,00,00,00,02,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2014"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,09,00,00,00,04,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2015"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,09,00,00,00,03,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2016"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,0a,00,00,00,02,00,02,00,\
00,00,00,00,00,00,00,00,04,00,05,00,01,00,02,00,00,00,00,00,00,00
"2017"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,09,00,00,00,04,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2018"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,09,00,00,00,03,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2019"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,0a,00,00,00,01,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2020"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,09,00,00,00,04,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2021"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,09,00,00,00,02,00,02,00,\
00,00,00,00,00,00,00,00,03,00,05,00,05,00,02,00,00,00,00,00,00,00
"2022"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,0a,00,00,00,01,00,02,00,\
00,00,00,00,00,00,00,00,04,00,05,00,01,00,02,00,00,00,00,00,00,00
"2023"=hex:88,ff,ff,ff,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