The following solution was tested for HP-UX B.11.31, and would probably work for all 11i versions.

Israel timezone is called IST. Israel daylight saving timezone is called IDT.

The quick and dirty:

Edit /usr/lib/tztab and append the following lines at the bottom:

# Israel daylight savings
# Added by Ez-Aton. years 2008 to 2011 only. Simple and ugly.
IST-2IDT
0 3 28 3 2008 5 IDT-3
0 1 5 10 2008 0 IST-2
0 3 27 3 2009 5 IDT-3
0 1 27 9 2009 0 IST-2
0 3 26 3 2010 5 IDT-3
0 1 12 9 2010 0 IST-2
0 3 1 4 2011 5 IDT-3
0 1 2 9 2011 0 IST-2

Save (this is a write-protected file, so force saving) and then edit /etc/TIMEZONE to include the following TZ directive:

TZ=IST-2IDT
export TZ

Assuming you sync your time using NTP, all future logins will have correct Israeli date and daylight savings.

For further information, you can check man tztab and man environ

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