Google Sheets – Combine Text from Rows by Specified Date

I am trying to create a summary sheet that combines the values and descriptions from my bank transaction into individual dates

I want to paste the transaction csv into google spreadsheets.
The columns are Date, Description, CheckNumber and Amount.

Here is my example sheet

What I want would be for Summary!D2 to combine the description of all rows that have the date 2/1/2014 (shown in Summary!A2) like this (including line feeds).

EDIT – Switched to Jacobs Method

Final code (Removes N/A error when nothing found in query):

=JOIN(CHAR(10),ARRAYFORMULA(IFERROR(QUERY(Transactions!A2:D, "SELECT B WHERE B IS NOT NULL AND A = date '" & text(Summary!A2,"yyyy-MM-dd") & "'") & ": ") & IFERROR(QUERY(Transactions!A2:D, "SELECT D WHERE D IS NOT NULL AND A = date '" & text(Summary!A2,"yyyy-MM-dd") & "'"))))

EDIT – Added amounts to lines of note

PartTime Payroll: 182.7 
Academy Payroll: 81.13
Recurring purchase at netflix.com: -7.99
ONLINE TRANSFER TO CC: XXXXXXXXXX: -49

The values in Summary are already showing what I want, which in this case is $206.84 which is the result of the Amounts with the date 2/1/2014 from Summary!A2, (182.7, 81.13, -7.99, -49).

EDIT – I figured it out

function updateNote(cellDate){
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sumSheet = ss.getActiveSheet();
  var transSheet = ss.getSheetByName('Transactions');
  var transSheetLastRow = transSheet.getLastRow();

  cellDate = cellDate.valueOf();
  var currDate;
  var note;
  var text;
  var amount;
  var space = ": ";

  for (var i = 2; i < transSheetLastRow; i++){
    var currDate = transSheet.getRange(i, 1).getValue().valueOf();

    if(cellDate == currDate){
      text = transSheet.getRange(i, 2).getValue();
      amount = transSheet.getRange(i, 4).getValue();

      if (!note){
        note = text + space + amount;
      }else{
        note = note + '\n' + text + space + amount;
      }
    }
  }
  return note;
}