The authority to set the date chosen is constitutional. Just as the constitution says that Electors are to be selected an the manner that the state legislatures determine (not by a court,) the U.S. Constitution says that the date the Electors meet is to be set by the U.S. Legislature, not by the courts.
Your moniker suits your comprehension.
The date is statutory only.
The Constitution does NOT require December 14. It could be any date set by Congress.
December 14 is not carved into constitutional stone.
Irrespective of the date December 14, the Court may proceed with this Emergency Writ and the Electoral College is now ON NOTICE that all of their business scheduled for tomorrow may be set aside because the date December 14 is statutory only and is not part of the Constitution.
To clarify:
The Act of setting a date
vs.
The Date itself.
In the Court’s jurisdiction,
the Act is constitutional, the Date is arbitrary as it is merely statutory.
Should the Court decide to issue this Emergency Writ of Mandamus, the Court does not usurp the powers of Congress to set a new date. Congress may convene to set a new date or in the alternative throw the election to a 50 vote majority of state delegations in the House of Representatives.