How to read the number of steps every month from Google?

Question

I want to read step counter data every month from Google, but the Google API is not supported by TimeUnit.YEAR, see

 new DataReadRequest.Builder()
            .aggregate(DataType.AGGREGATE_STEP_COUNT_DELTA, DataType.AGGREGATE_STEP_COUNT_DELTA)
            .bucketByTime(30,TimeUnit.DAYS)
            .setTimeRange(calendar.getTimeInMillis(),endCalendar.getTimeInMillis() , TimeUnit.MILLISECONDS)
            .build()

I can get data every 30 days, not a month. The reason for the month may be 28.29.30 or 31 days.

So is there a way to get it?