static CallTaskDtoLegacy callTaskDto(CallTask callTask, String zoneOffset) {
        long createdSec = callTask.getCreated();
        long createdMillis = createdSec * 1000;
        String createdFormatted = TimeFormatService.formattedDateTimeFromMillis(createdMillis, zoneOffset);

        Optional<Long> taskFinishedTimestampMillis;
        if (callTask.getState() == CallTask.State.PERFORMED || callTask.getState() == CallTask.State.FAILED) {
            long performedTimestampSec = callTask.getPerformedTimestamp();
            taskFinishedTimestampMillis = Optional.of(performedTimestampSec * 1000);
        } else {
            taskFinishedTimestampMillis = Optional.empty();
        }
        String taskFinishedFormatted = taskFinishedTimestampMillis
                .map(t -> TimeFormatService.formattedDateTimeFromMillis(t, zoneOffset))
                .orElse(null);

        Optional<Long> callAnsweredTimestampMillis = callAnsweredTimestampMillis(callTask);

        String callAnsweredFormatted = callAnsweredTimestampMillis
                .map(t -> TimeFormatService.formattedDateTimeFromMillis(t, zoneOffset))
                .orElse(null);

        return new CallTaskDtoLegacy(callTask.getId(),
                callTask.getPhone(),
                READABLE_STATES.get(callTask.getState()),
                callTask.getState(),
                createdMillis,
                createdFormatted,
                callAnsweredTimestampMillis.orElse(null),
                callAnsweredFormatted,
                taskFinishedTimestampMillis.orElse(null),
                taskFinishedFormatted,
                zoneOffset,
                combineParametersAndReportParameters(callTask),
                outgoingCalls(callTask.getOutgoingCalls(), zoneOffset),
                results(callTask.getScenarioResult()),
                logs(callTask),
                callTask.getFailComment(),
                combineParametersAndReportParameters(callTask),
                callTask.getTalkMillis()
        );
    }

private static List<CallTaskDtoLegacy.CallDto> outgoingCalls(List<OutgoingCall> calls, String zoneOffset) {
        return calls.stream()
                .map(c -> from(c, zoneOffset))
                .collect(Collectors.toList());
    }