#376: Fixed the issue where interventions are shown in a different ti…

…me slot in the Study Timeline calendar.

* Later on in the code we use Transformers.toOffsetDateTime function, where the "Europe/Vienna" timezone is hardcoded, but we need to consider this timezone in the cronExpression as well, when we calculate the interventions.

studymanager/src/main/java/io/redlink/more/studymanager/utils/SchedulerUtils.java

@@ -145,6 +145,7 @@ private static List<Instant> parseToInterventionSchedulesForScheduledTrigger(Tri
         if (CronExpression.isValidExpression(cronString)) {
             try {
                 CronExpression cronExpression = new CronExpression(cronString);
+                cronExpression.setTimeZone(TimeZone.getTimeZone(ZoneId.of("Europe/Vienna")));
                 Instant currentDate = cronExpression.getNextValidTimeAfter(Date.from(start)).toInstant();
                 while (currentDate.isBefore(end)) {
                     events.add(currentDate);