Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Team | Outgoing manager | Manner of departure | Date of vacancy | Replaced by | Date of appointment |
| --- | --- | --- | --- | --- | --- |
| Albion Rovers | John McCormack | Resigned | 28 June | Paul Martin | 9 July |
| Heart of Midlothian | Stephen Frail | Sacked | 9 July | Csaba László | 11 July |
| Dundee | Alex Rae | Sacked | 20 October | Jocky Scott | 30 October |
| Montrose | Jim Weir | Sacked | 19 October | Steven Tweed | 15 January |
| Berwick Rangers | Alan McGonigal | Resigned | 13 November | Jimmy Crease | 26 December |
| Livingston | Roberto Landi | Sacked | 1 December | Paul Hegarty | 5 December |
| Brechin City | Michael O'Neill | Resigned | 15 December | Jim Duffy | 9 January |
| Elgin City | Robbie Williamson | Resigned | 20 December | Ross Jack | 23 January |
| Inverness CT | Craig Brewster | Sacked | 19 January | Terry Butcher | 27 January |
| Stranraer | Derek Ferguson | Resigned | 24 January | Keith Knox | 17 February |
| East Fife | Dave Baikie | Resigned | 14 April | Stevie Crawford | 14 April |
| Livingston | Paul Hegarty | Suspended | 25 April | John Murphy | 30 June |
| Aberdeen | Jimmy Calderwood | Mutual consent | 24 May | Mark McGhee | 12 June |
| Celtic | Gordon Strachan | Resigned | 25 May | Tony Mowbray | 16 June |
| Hibernian | Mixu Paatelainen | Resigned | 29 May | John Hughes | 8 June |
| Falkirk | John Hughes | Resigned | 8 June | Eddie May | 23 June |
| Motherwell | Mark McGhee | Resigned | 12 June | Jim Gannon | 30 June |
Question:
What is the vacancy date of Dundee?
Answer:
20 October