fromMillis not handling PN picture string

[alexwoodgate]

I'm trying to format a timestamp with the AM/PM marker in uppercase with $fromMillis(). Looking at the JSONata doc https://docs.jsonata.org/date-time-functions#frommillis which points to https://www.w3.org/TR/xpath-functions-31/#date-picture-string I can see some examples with [PN] for upper case (3:58 PM format-time($t, "[h]:[m01] [PN]", "en", (), ()) ) and [Pn] for lower case (3:58:45 pm format-time($t, "[h]:[m01]:[s01] [Pn]", "en", (), ()).

I've tried out some equivalent picture values on https://try.jsonata.org/ with:
$fromMillis($millis(), "[h]:[m01] [Pn]") which also returns "10:17 am" (Correct)
$fromMillis($millis(), "[h]:[m01] [PN]") which returns "10:17 am" (I believe this is incorrect and should be "10:17 AM")

I've been able to work around this with $uppercase() so it's a minor issue but I wanted to raise here to confirm whether the behaviour is incorrect for [PN] or if I'm misunderstanding how this should work. Thanks.

[bennyb0i]

Any luck with this issue? I've run into a very similar case trying to format a timestamp using $fromMillis() as well.

My JSONata excerpt: $fromMillis($toMillis($split(payload.timestamp,' ')[1], '[H01]:[m01]:[s01]'),'[h]:[m01][PN]'); also returns am/pm, instead of AM/PM as it apparently should.