As a matter of fact, this year, summer time in Israel starts at 3-Apr-93 till 4-Sep-93. Every year the dates of summer time are decided at that year and cannot be anticipated.

I.e., either Ephraim Silverberg, who contributed the most-recently-seen rules for Israel, as seen in "/usr/share/lib/zoneinfo/asia" in SunOS 4.x and 5.x systems and elsewhere: # From Ephraim Silverberg (April 18, 1989): # Prior to 1989, the rules concerning Daylight Savings Time changed every # year; as information, regarding exact times and dates during this period, # is not readily available at the present time, the rules commence starting # with the year 1989. # From 1989 onwards the rules are as follows: # # 1. Daylight Savings Time commences midnight of the first Saturday night # following the seven-day festival of Pesach (Passover). The transition # is from midnight Israel Standard Time to 1 a.m. Israel Daylight Savings # time. As the Pesach festival is dependent on the Lunar calendar (the # first day is always on the 15th day of the month of Nisan), the rule # changes every year on the Gregorian calendar. # # 2. Standard Time is reinstated on the Saturday night whereupon Jews # following the Ashkenazi (European) rite begin to recite the Selichot # (forgiveness) prayers prior to the Jewish Lunar New Year. The transition # is from midnight Israel Daylight Savings time to 11 p.m. Israel Standard # Time. The law (according to the Ashkenazi custom) concerning the # commencement of the Selichot prayers is described in chapter 128, section # 5 of the "Code of Jewish Law," by Rabbi Shlomo Ganzfried (translated by # Hyman E. Goldin): # # Beginning with the Sunday [**] before Rosh Hashanah [***], # we rise early for the service of Selichot (supplications for # forgiveness). If Rosh Hashanah occurs on Monday or Tuesday, we # begin saying the Selichot from the Sunday of the preceding week. # # This, too, varies from year to year on the Gregorian calendar and, thus, # two explicit timezone rules are required for each Gregorian year. # # [**] actually Saturday night as the Jewish day commences at nightfall. # [***] the Jewish Lunar New Year. was mistaken, or, after he sent that information out, the government went back to changing the rules every year? (Please "Cc:" "tz@elsie.nci.nih.gov" on any responses.)