Hi Tommy,
The code is written in Java, as follows.
int minutes = (int) Duration.between(start, end).toMinutes();
creationRequest.setStart_time(start.format(DateTimeFormatter.ISO_INSTANT));
creationRequest.setDuration(minutes);
DateTimeFormatter.ISO_INSTANT is ISO-8601 format as documented in javadoc of JVM.
This appears to be the format Zoom API has specified in update meeting API?