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:
| Episode # | Original Air Date (UK) | Episode Title | Director | Writer | Cast |
| --- | --- | --- | --- | --- | --- |
| 3-01 | 30 July 1981 | Night Games | Derek Martinus | Nick McCarty | Stafford Gordon , Roy Holder |
| 3-02 | 6 August 1981 | Have a Happy Day | James Ormerod | Nick McCarty | Stafford Gordon, Roy Holder |
| 3-03 | 13 August 1981 | Another Happy Day | James Ormerod | Nick McCarty | Stafford Gordon, Roy Holder |
| 3-04 | 20 August 1981 | The Macau Connection | Derek Martinus | Nick McCarty | Stafford Gordon, Roy Holder |
| 3-05 | 27 August 1981 | Loyalties II | Derek Martinus | Nick McCarty | Stafford Gordon, Roy Holder |
Question:
What is the original air date of the episode "Another Happy Day"?
Answer:
13 August 1981