…that in Israel, the official calendar is the Hebrew Calendar?
Even though most dates and secular occasions in Israel follow the Gregorian calendar, the official calendar of the modern State of Israel is the Hebrew one.
National Holidays (such as Independence Day, Yom Yerushalaim, etc) are celebrated on their Hebrew dates and therefore fall every year on another date, according to the Gregorian Calendar.
The Hebrew calendar is a luni-solar calendar of 12 months divided into 29 or 30 days per month. According to Jewish tradition, the calendar starts counting from the time of creation (5783 years ago).
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