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 |
| --- | --- | --- | --- | --- | --- |
| Clyde | Joe Miller | Mutual consent | 25 May | Colin Hendry | 11 June |
| St. Johnstone | Owen Coyle | Mutual consent | 22 November | Derek McInnes | 27 November |
| Dunfermline Athletic | Stephen Kenny | Sacked | 4 December | Jim McIntyre | 3 January |
| Clyde | Colin Hendry | Resigned | 18 January | John Brown | 26 January |
| Greenock Morton | Jim McInally | Resigned | 12 February | David Irons | 19 February |
Question:
What days are vacant that were replaced by john brown?
Answer:
18 January