Editing Hebrew calendar (section)

===Days===
{{See also|Zmanim#Evening}}
Based on the classic rabbinic interpretation of {{Bibleverse|Genesis|1:5|HE}} ("There was evening and there was morning, one day"), a day in the rabbinic Hebrew calendar runs from sunset (the start of "the evening") to the next sunset.<ref>{{cite book |url=https://books.google.com/books?id=t8VZga76bw4C&q=%22jewish+day+begins%22+evening&pg=PA169 |title=The Torah For Dummies |first=Arthur |last=Kurzweil |year= 2011 |publisher=John Wiley & Sons |isbn=9781118051832 |via=Google Books}}</ref> Similarly, [[Yom Kippur]], [[Passover]], and [[Shabbat]] are described in the Bible as lasting "from evening to evening".<ref>{{Bibleverse|Leviticus|23:32|HE}}; {{Bibleverse|Exodus|12:18|HE}}; regarding Shabbat ({{Bibleverse|Nehemiah|13:19|HE}}) only the beginning time is mentioned.</ref> The days are therefore figured locally.

[[Halakha|Halachically]], the exact time when days begin or end is uncertain: this time could be either sundown (''shekiah'') or else nightfall (''tzait ha'kochavim'', "when the stars appear"). The time between sundown and nightfall (''bein hashmashot'') is of uncertain status.<ref>{{cite web |title=Zmanim Briefly Defined and Explained |website= chabad.org |url=https://www.chabad.org/library/article_cdo/aid/134527/jewish/Zmanim-Briefly-Defined-and-Explained.htm}}</ref> Thus (for example) observance of [[Shabbat]] begins before sundown on Friday and ends after nightfall on Saturday, to be sure that Shabbat is not violated no matter when the transition between days occurs.

Instead of the [[International Date Line]] convention, there are varying opinions as to where the day changes.<ref>{{cite web |first=Willie |last=Roth |url=http://koltorah.org/ravj/The%20International%20Date%20Line%20and%20Halacha.htm |title=The International Date Line and ''Halacha''  |date=March 1, 2002  |url-status=dead |archive-date=July 18, 2011 |website=koltorah.org |archive-url=https://web.archive.org/web/20110718065425/http://koltorah.org/ravj/The%20International%20Date%20Line%20and%20Halacha.htm }}.</ref><ref>"Appendix II: Baal HaMaor's Interpretation of 20b and its Relevance to the Dateline" in ''Talmud Bavli'', Schottenstein Edition, Tractate ''Rosh HaShanah'', Mesorah Publications Ltd. ("ArtScroll") 1999, where "20b" refers to the 20th page 2nd folio of the tractate.</ref> (See [[International date line in Judaism]].)