[XeTeX] datetime2 package and XeTeX

[Akira Kakuto]

> I don't know the new datetime2 package, but probably
> it depends on primitives such as \pdfcreationdate, and
> \pdffilemoddate.
> At present they are only in the pdfTeX engine.

eptex and euptex also have the primitives.

Best,
Akira