Github user afs commented on a diff in the pull request: https://github.com/apache/jena/pull/148#discussion_r66245039 --- Diff: jena-arq/src/main/java/org/apache/jena/sparql/expr/nodevalue/XSDFuncOp.java --- @@ -1554,4 +1551,55 @@ private static Duration valueCanonicalDuration(NodeValue nv) { // dur = ... return dur ; } + + public static NodeValue adjustDatetimeToTimezone(NodeValue nv1,NodeValue nv2){ + if(nv1 == null) + return null; + + if(!nv1.isDateTime() && !nv1.isDate() && !nv1.isTime()){ + throw new ExprEvalException("Not a valid date, datetime or time:"+nv1); + } + + XMLGregorianCalendar calValue = nv1.getDateTime(); + Boolean hasTz = calValue.getTimezone() != DatatypeConstants.FIELD_UNDEFINED; + int inputOffset = 0; + if(hasTz){ + inputOffset = calValue.getTimezone(); + } + + int tzOffset = TimeZone.getDefault().getRawOffset() / (1000*60); + if(nv2 != null){ + if(!nv2.isDuration()) { + String nv2StrValue = nv2.getString(); + if(nv2StrValue.equals("")){ + calValue.setTimezone(DatatypeConstants.FIELD_UNDEFINED); + if(nv1.isDateTime()) + return NodeValue.makeDateTime(calValue); + else if(nv1.isTime()) + return NodeValue.makeNode(calValue.toXMLFormat(),XSDDatatype.XSDtime); + else + return NodeValue.makeDate(calValue); + } + throw new ExprEvalException("Not a valid duration:" + nv2); + } + Duration tzDuration = nv2.getDuration(); + tzOffset = tzDuration.getSign()*(tzDuration.getMinutes() + 60*tzDuration.getHours()); + if(tzDuration.getSeconds() > 0) + throw new ExprEvalException("The timezone duration should be an integral number of minutes"); + int absTzOffset = java.lang.Math.abs(tzOffset); + if(absTzOffset > 14*60) + throw new ExprEvalException("The timezone should be a duration between -PT14H and PT14H."); + } + String tzSign = (tzOffset-inputOffset) > 0 ? "" : "-"; + Duration durToAdd = NodeValue.makeDuration(tzSign+"PT"+java.lang.Math.abs(tzOffset-inputOffset)+"M").getDuration(); --- End diff -- Could this be done with something like `NodeValue.xmlDatatypeFactory.createDurationDayTime(tzOffset-inputOffset)`? It avoids string parsing.
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