The Nise data seems to be generated incorrectly if the time period involves the year-end period, e.g., December + January data. Consequently,  raw calcs tests are currently failing.

The issue is probably in _create_month_list function:

 while current <= end_date:
    ...
    if current.month < end_date.month:
        month["end"] = (month.get("end") + relativedelta(days=1)).replace(hour=0, minute=0) 

I believe we need: January 2022 > December 2021,
but the code evaluates it as 1 < 12, i.e,  January 2022 < December 2021

end_month_first_day = end_date.replace(day=1)
while current <= end_date:
    ....
    if current < end_month_first_day:
       month["end"] = (month.get("end") + relativedelta(days=1)).replace(hour=0, minute=0)

 
https://github.com/project-koku/nise/blob/e7ac513b2825297e9f68376e144793d5b0302937/nise/report.py#L288 

We have to fix also the corresponding unittest test_create_month_list, which uses the following test data:{*}
{*}

June-July data:

• the end date for June is July 1 (expected??)

• {
                  "start_date": datetime.datetime(year=2021, month=6, day=1),
                  "end_date": datetime.datetime(year=2021, month=7, day=29),
                  "expected_list": [
                      {
                          "name": "June",
                          "start": datetime.datetime(year=2021, month=6, day=1),
                          "end": datetime.datetime(year=2021, month=7, day=1, hour=0, minute=0),
                      },
                      {
                          "name": "July",
                          "start": datetime.datetime(year=2021, month=7, day=1),
                          "end": datetime.datetime(year=2021, month=7, day=29, hour=23, minute=59),
                      },
                  ],
              },

November-December-January data:

• November 30 is used as the end date for November (unexpected??) instead of December 1

• December 31 is used as the end date for December (unexpected??) instead of January 1

{
                "start_date": datetime.datetime(year=2018, month=11, day=15),
                "end_date": datetime.datetime(year=2019, month=1, day=5),
                "expected_list": [
                    {
                        "name": "November",
                        "start": datetime.datetime(year=2018, month=11, day=15),
                        "end": datetime.datetime(year=2018, month=11, day=30, hour=23, minute=59),
                    },
                    {
                        "name": "December",
                        "start": datetime.datetime(year=2018, month=12, day=1),
                        "end": datetime.datetime(year=2018, month=12, day=31, hour=23, minute=59),
                    },
                    {
                        "name": "January",
                        "start": datetime.datetime(year=2019, month=1, day=1),
                        "end": datetime.datetime(year=2019, month=1, day=5, hour=23, minute=59),
                    },
                ],
            }, 

https://github.com/project-koku/nise/blob/e7ac513b2825297e9f68376e144793d5b0302937/tests/test_report.py#L146