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:
| English name | Irish name | Numeral | Reverse | Introduction | Withdrawal | £1 Fraction |
| --- | --- | --- | --- | --- | --- | --- |
| Farthing | Feoirling | ¼d | Woodcock | 12 December 1928 | 1 January 1962 | 1/960 |
| Halfpenny | Leath Phingin | ½d | Sow and litter | 12 December 1928 | 1 August 1969 | 1/480 |
| Penny | Pingin | 1d | Hen and chickens | 12 December 1928 | 1 January 1972 | 1/240 |
| Threepence | Leath Reul | 3d | Hare | 12 December 1928 | 1 January 1972 | 1/80 |
| Sixpence | Reul | 6d | Wolfhound | 12 December 1928 | 1 January 1972 | 1/40 |
| Shilling | Scilling | 1s | Bull | 12 December 1928 | 1 January 1993 | 1/20 |
| Florin | Flóirín | 2s | Salmon | 12 December 1928 | 1 June 1994 | 1/10 |
| Half-Crown | Leath Choróin | 2s6d | Horse | 12 December 1928 | 1 January 1970 | 1/8 |
Question:
What date was the 6d introduced?
Answer:
12 December 1928