Not quite :) that Austria game was Sunday 30th May 1971. We also played the away tie against Austria in that campaign on Sunday 10th October 1971.
Since then the following Home games have been played on Sundays:
21st October 1973 - Friendly - Poland in Dalymount
24th April 1977 - Friendly - Poland in Dalymount
26th May 1985 - Friendly - Spain in Flower Lodge, Cork
2nd June 1985 - WCQ - Switzerland in Lansdowne
22nd May 1988 - Friendly - Poland in Lansdowne
28th May 1989 - WCQ - Malta in Lansdowne
4th June 1989 - WCQ - Hungary in Lansdowne
5th June 1994 - Friendly - Czech Republic in Lansdowne
11th June 1995 - ECQ - Austria in Lansdowne
2nd June 1996 - Friendly - Croatia in Lansdowne
10th November 1996 - WCQ - Iceland in Lansdowne
There have also been several away games played on Sundays, friendlies, testimonials, invitation tournaments, EC and WC qualifers and of course in the WC and EC finals.