code: public static OffsetDateTime toOffsetDateTime(long timestamp, ZoneId zoneId) {
  
  		Instant time = Instant.ofEpochMilli(timestamp);
  		return toOffsetDateTime(time, zoneId);
  	}
docs: Converts timestamp into OffsetDatetime
  
  @param timestamp to be converted
  @param zoneId    desired zone or null to take instant zone id
  @return OffsetDatetime representation of timestamp