1 of 1 people found this helpful
Tableau simply displays what it is given by the source.
I suspect you'll need to adjust the locale of the machine (the one with the source), or the local configuration (again of the source)
or actually amend the source data (either at source, not a good idea) or as a 2 step, transformation process.
It does appear (i have never used as-400) but it does offer some support functions
as well as