[ The formulae and continuum were an interesting idea, but only seem to be being used as “create a formula that sets X to the year you want, and use it”, these days, and I wonder if they’re scaring people off. Maybe we should just explicitly play it as “set X to the year you want”. ]

Reword the Rule “The Continuum” to:-

The time-space continuum is always weakened around one particular date, which changes according to the acts of Travellers - this is known as the “Focus Date”, and is tracked in a second GNDT.

Add to the Modus Ponens:-

Continuum Swirling
Requirements: None.
Action: The Traveller may alter either the year, month or day value of the Focus Date.

Continuum Jump
Requirements: The Traveller has not altered the Focus Date earlier in the current set of actions, and the Focus Date is a valid Game Date.
Action: The Traveller may set their TL to the current Focus Date.

Repeal the “No vandalizing other people’s Time Machines” Law of Time.