我需要根据一些条件生成一个完整的月报告。第一个条件是-我从用户那里取一个匿名日期，在检查所有条件后，它将生成完整的月报告。
我试图生成报告，但这是返回一个天明智的报告。一切都很好，除了月份。请帮助我这样做。

[HttpGet("inner-join/{id}")]
[ProducesResponseType(StatusCodes.Status200OK)]
[ProducesResponseType(StatusCodes.Status500InternalServerError)]
public IActionResult GetReport(DateTime id)
{
  try
  {
    IEnumerable<BTBPending> objBTBPendingList = _unitOfWork.BTBPending.GetAll(includeProperties: "ProformaInvoice,ContractList,SupplierList,CountryList,ItemList,BuyerList,StyleList,TradeTermList,ErpRemarksList,StatusList,LcNoList,UdAmendList");

    IEnumerable<ProformaInvoice> objProformaInvoiceList = _unitOfWork.ProformaInvoice.GetAll(includeProperties: "ActualContract,ContractList,SupplierList,CountryList,ItemList,BuyerList,StyleList,TradeTermList");

    var query = objBTBPendingList
        .Where(x => x.LcOpenDate == id)
        .Where(x => x.CountryListId == 26)
        .Where(x => x.StatusListId == 12 || x.StatusListId == 13 || x.StatusListId == 14)
        .Join(objProformaInvoiceList,
              btbPending => btbPending.ContractListId,
              pi => pi.ContractListId, 
              (btbPending, pi) => new
              {
                LcNo = btbPending.LcNoList,
                Value = btbPending.PiValue,

                ContractNo = pi.ContractList,
                Buyer = pi.BuyerList,
                PiNo = pi.PINo,
                Supplier = pi.SupplierList,
                Item = pi.ItemList
              }).ToList();

     return Ok(query);
   }
 catch (Exception ex)
   {
     return StatusCode(500, "Internal Server Error, Please Try Again Leter!");
   }
}