ACI Dealing Certificate (#416)

In the unforeseen event that a particular maturity date is declared a public holiday, what is standard market practice for spot FX?

to extend the contract to the next business day
to shorten the contract to the previous business day
The two parties involved agree to a new maturity date.
There is no standard market practice. ACIs Committee for Professionalism decides the issue on a case-by-case basis.