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:
| Tie no | Home team | Score | Away team | Date |
| --- | --- | --- | --- | --- |
| 1 | Chester | 1–0 | Barnsley | 18 December 1979 |
| 2 | Croydon | 1–1 | Millwall | 15 December 1979 |
| Replay | Millwall | 3–2 | Croydon | 18 December 1979 |
| 3 | Darlington | 0–1 | Bradford City | 15 December 1979 |
| 4 | Bury | 0–0 | York City | 15 December 1979 |
| Replay | York City | 0–2 | Bury | 18 December 1979 |
| 5 | Yeovil Town | 1–0 | Slough Town | 15 December 1979 |
| 6 | Reading | 3–1 | Barking | 15 December 1979 |
| 7 | Walsall | 1–1 | Halifax Town | 15 December 1979 |
| Replay | Halifax Town | 1–1 | Walsall | 18 December 1979 |
| Replay | Halifax Town | 2–0 | Walsall | 24 December 1979 |
| 8 | Blackburn Rovers | 2–0 | Stafford Rangers | 17 December 1979 |
| 9 | Grimsby Town | 2–0 | Sheffield United | 15 December 1979 |
| 10 | Northwich Victoria | 2–2 | Wigan Athletic | 5 January 1980 |
| Replay | Wigan Athletic | 1–0 | Northwich Victoria | 7 January 1980 |
| 11 | Doncaster Rovers | 1–2 | Mansfield Town | 15 December 1979 |
| 12 | Tranmere Rovers | 2–2 | Rochdale | 15 December 1979 |
| Replay | Rochdale | 2–1 | Tranmere Rovers | 18 December 1979 |
| 13 | Carlisle United | 3–0 | Sheffield Wednesday | 15 December 1979 |
| 14 | Wimbledon | 0–0 | Portsmouth | 18 December 1979 |
| Replay | Portsmouth | 3–3 | Wimbledon | 24 December 1979 |
| Replay | Wimbledon | 0–1 | Portsmouth | 5 January 1980 |
| 15 | Southend United | 1–1 | Harlow Town | 15 December 1979 |
| Replay | Harlow Town | 1–0 | Southend United | 18 December 1979 |
| 16 | Chesham United | 1–1 | Merthyr Tydfil | 19 December 1979 |
| Replay | Merthyr Tydfil | 1–3 | Chesham United | 22 December 1979 |
| 17 | Torquay United | 3–3 | Swindon Town | 18 December 1979 |
| Replay | Swindon Town | 3–2 | Torquay United | 22 December 1979 |
| 18 | Hereford United | 1–2 | Aldershot | 15 December 1979 |
| 19 | Rotherham United | 0–2 | Altrincham | 15 December 1979 |
| 20 | Colchester United | 1–0 | Bournemouth | 15 December 1979 |
Question:
When has a Tie no of 15?
Answer:
15 December 1979