Github user afs commented on the issue:
https://github.com/apache/jena/pull/148
It's a good thing it's summer where I am (British Summer Time)!
My reading of https://www.w3.org/TR/xpath-functions-3/#timezone.functions
is that conversions where there is no provided timezone use local time,
including daylight savings time.
In the tests `TimeZone.getDefault().getRawOffset()` returns the offset
without regard for the local daylight savings time.
Also allowing for timezones which are negative offsets, I came up with:
```
private String getDynamicDurationString(){
int tzOffset = TimeZone.getDefault().getOffset(new
Date().getTime())/(1000*60) ;
String x = "PT"+Math.abs(tzOffset)+"M";
if ( tzOffset < 0 )
x = "-"+x ;
return x ;
}
```
`XSDFuncOp.adjustDatetimeToTimezone` also needs this.
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