Editing World Calendar (section)

=== Religious objections ===
The main opponents of the World Calendar in the 20th century were leaders of religions that worship according to a seven-day cycle. For Jews, Christians and Muslims, particular days of worship are ancient and fundamental elements of their faith.<ref>{{cite magazine|url=http://www.time.com/time/magazine/article/0,9171,748231,00.html|archive-url=https://web.archive.org/web/20070324131019/http://www.time.com/time/magazine/article/0,9171,748231,00.html|url-status=dead|archive-date=24 March 2007|magazine=[[Time (magazine)|TIME]]|title=Calendar Reform|date=17 December 1934|access-date=6 March 2009}}</ref>

Jews observe Saturday as ''[[Shabbat]]'', on the basis of the [[Ten Commandments|Decalogue]]'s injunction to "[[remember the sabbath day, to keep it holy]]" (Exodus 20:8). Most Christians worship on [[Sabbath in Christianity|Sunday]], the [[Lord's Day]], on which they believe Christ rose from the dead. Muslims perform the ''[[jumu'ah]]'' prayer in Mosques on Fridays, the day they believe Adam was created. Likewise, [[Seventh-day Adventist Church|Seventh-day Adventists]] are required to worship every Saturday.

Adherents of these religions object that intercalary days are counted outside the usual seven-day week and disrupt the traditional weekly cycle. A week with a Worldsday would be eight days long. Some adherents of these religions insist that they would have to continue observing their holidays every seventh day, causing the worship days to drift by one day each year (two on a leap year), relative to the World Calendar week. The day of rest would then no longer coincide with the weekend.

These concerns played a role in the United States government's decision, at the United Nations, in 1955, not to recommend further study.<ref>Your Washington Review by Congressman Jerry Ford, For Release 5 May 1955, [http://www.fordlibrarymuseum.gov/library/document/fordcong/4525448.pdf From page 11 of an online collection of Box D1 of the Gerald R. Ford Congressional Papers at the Gerald R. Ford Presidential Library.] Jerry Ford wrote: "... I have received numerous letters in opposition to the proposed world caleridar change. I am in complete agreement with the opinions expressed in these letters and I will oppose any calendar change. The Department of State advises me that the United Nations may set up a study group on calendar reform. Secretary John Foster Dulles and our representatives at the U. N. are not in favor of this action and the United States will officially oppose setting up this U.N. study group on calendar reform. I have also been informed that our State Department will hold to that position until there is Congressional authorization for the calendar study. From my observations it seems that Congress is in no mood to tamper with the calendar."</ref>

Supporters of the World Calendar do not deny that their system is at odds with the traditions of a significant portion of the world's population, but argue that Worldsdays and Leapyear Days can be treated as "double" holidays by those who wish to maintain the seven-day week sequence.{{citation needed|date=May 2018}}