Israel Summer Time

Israel Summer Time (Hebrew: שעון קיץ‎‎ sha'on kayits  "Summer Clock"), also in English, Israel Daylight Time (IDT) is the practice in Israel by which clocks are advanced by one hour, beginning on the Friday before the last Sunday of March, and ending on the last Sunday of October.

Before 1992, daylight saving was governed by the Time Act, a law inherited by Israel from the British Mandate of Palestine, which started to use daylight saving in World War II. Summer Time was introduced in Israel between the years 1948–1957, but the length of Daylight Saving Time has changed significantly depending on the year. In 1951–1952, it was enacted for about seven months, whereas in the years 1953–1954 it was enacted for only three months. In 1958, daylight saving time was canceled. Due to the global energy crisis because of the aftermath of the Yom Kippur War, Summer Time was enacted again from 1974–1975.

Up until 1992, daylight saving time was operated by an order of the minister of the interior. In 1980 the authority of the minister for this matter was contested in an appeal to the supreme court. The supreme court decided that the minister's authority was indeed more limited than the common practice, as he may only decide on the dates of IDT while its operation is unquestionable. Following this decision the Knesset amended the Time Act so the minister will also have the authority to abolish IDT in a certain year.

The Law Determining the Time (Hebrew: חוק קביעת הזמן‎‎ Hok Kvi'at Hazman) is an Israel law governing Israeli daylight saving time. It was approved by the Knesset in 1992, replacing the British Mandate of Palestine time act inherited by Israel. The 1992 time zone law cancelled the Time Act, and stipulated that IDT will be operated for at least 150 days each year, and that the final dates will be decided by the minister of the Interior, subject to the approval of the Knesset committee for internal affairs. In some years the decision as to which day summer time would start or end was made at the very last minute due to political haggling and this caused disruption to international airline schedules at Ben Gurion Airport. A tragicomical demonstration of the uncertainty around IDT was in 1999 when two Palestinian car bombs exploded one hour too early, killing only the bombers themselves.

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