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:
| Date | Venue | Score | Result | Competition |
| --- | --- | --- | --- | --- |
| 30 April 2003 | Rheinpark Stadion , Vaduz | 1–0 | 1–0 | Friendly |
| 20 August 2003 | Rheinpark Stadion, Vaduz | 2–0 | 2–2 | Friendly |
| 10 October 2004 | Rheinpark Stadion, Vaduz | 1–2 | 2–2 | 2006 World Cup qualifier |
| 13 October 2004 | Stade Josy Barthel , Luxembourg | 2–0 | 4–0 | 2006 World Cup qualifier |
| 13 October 2004 | Stade Josy Barthel , Luxembourg | 4–0 | 4–0 | 2006 World Cup qualifier |
| 24 March 2007 | Rheinpark Stadion, Vaduz | 1–3 | 1–4 | Euro 2008 qualifier |
| 26 March 2008 | Ta' Qali National Stadium , Ta' Qali | 1–4 | 1–7 | Friendly |
Question:
Name the date that has a friendly competition at rheinpark stadion, vaduz
Answer:
30 April 2003, 20 August 2003