Table:
text: 1997 Super Tourenwagen Cup season
Race calendar and winners
Race calendar and winners
Round Race Circuit Date_ Event Winning_driver
1 Int. ADAC-Preis Hockenheim Hockenheimring 27 April Sprint Race Laurent Aiello Laurent Aiello
2 Bergischer Löwe Zolder Zolder 11 May Sprint Race Joachim Winkelhock Joachim Winkelhock
3 75. Eifelrennen Nürburgring 25 May Sprint Race Laurent Aiello Laurent Aiello
4 70. Geburstags des Sachsenringen Sachsenring 15 June Sprint Race Johnny Cecotto Johnny Cecotto
5 55. Int. ADAC Norisring Rennen Norisring 29 June Sprint Race Joachim Winkelhock Joachim Winkelhock
6 ADAC Wunstorf Wunstorf 13 July Sprint Race Laurent Aiello Laurent Aiello
7 Int. ADAC Preis von Zweibrücken Zweibrücken 10 August Sprint Race Laurent Aiello Emanuele Pirro

Question: What is the date of round "2" for the 1997 Super Touring Car Cup season?