How to convert DateTime Era correctly

[Nut41tank]

I try to use DateFormat to convert DateTime to locale
but I found that it need to convert ERA from AD to BC too And I'm not sure how to do so.

[natebosch]

This issue is not actionable. You should be able to print the era with DateFormat, but if you want a date representing some time in the BC (or BCE) era you'll need to find such a date before formatting to a String.

If this is still a problem for you please elaborate on the issue and include a minimal reproduction code sample to demonstrate.