> My second thought was how funny it would be to swap calendars to get out of a truce early.

Congress did something similar last year - National Emergencies declared by the president, such as for tariffs, are required by law to be reviewed within 15 days by Congress. So Congress redefined the calendar so that the remainder of the days during that session are not officially considered to be calendar days. https://www.nytimes.com/2025/04/10/us/congress-johnson-calen...