IMHO we should wait and see how the jQuery version evolves (at least for now). Once the format description is linked with ARIA (Bug #1259388) the ability to manually enter a date/time in the correct format should constitute an "accessible alternate version" - at least for WCAG AA.
Definitely something we should look into in the future, but for now it's probably more of a nice-to-have than a necessity.
IMHO we should wait and see how the jQuery version evolves (at least for now). Once the format description is linked with ARIA (Bug #1259388) the ability to manually enter a date/time in the correct format should constitute an "accessible alternate version" - at least for WCAG AA.
Definitely something we should look into in the future, but for now it's probably more of a nice-to-have than a necessity.