Comment 3 for bug 1222345

Good catch!
Probably originated from the table on the following Wikipedia article:
https://en.wikipedia.org/wiki/Talk:Israel_Summer_Time

Although the diff says:
 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
 Rule Zion 2013 max - Mar Fri>=23 2:00 1:00 D
-Rule Zion 2013 2026 - Oct Sun>=2 2:00 0 S
-Rule Zion 2027 only - Oct Mon>=3 2:00 0 S
-Rule Zion 2028 max - Oct Sun>=2 2:00 0 S
-# The following rules are commented out for now, as they break older
-# versions of zic that support only signed 32-bit timestamps, i.e.,
-# through 2038-01-19 03:14:07 UTC.
-#Rule Zion 2028 2053 - Oct Sun>=2 2:00 0 S
-#Rule Zion 2054 only - Oct Mon>=3 2:00 0 S
-#Rule Zion 2055 2080 - Oct Sun>=2 2:00 0 S
-#Rule Zion 2081 only - Oct Mon>=3 2:00 0 S
-#Rule Zion 2082 max - Oct Sun>=2 2:00 0 S
+Rule Zion 2013 max - Oct lastSun 2:00 0 S

And lastSunday of October is October 27.