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 | City | Opponent | Results¹ | Type of game |
| --- | --- | --- | --- | --- |
| February 27 | İzmir , Turkey | Turkey | 1:1 | Friendly |
| March 27 | Belgrade | Northern Ireland | 4:1 | Euro '92 Qualifier |
| May 1 | Belgrade | Denmark | 1:2 | Euro '92 Qualifier |
| May 16 | Belgrade | Faroe Islands | 7:0 | Euro '92 Qualifier |
| August 8 | Aosta , Italy | Czechoslovakia | 3:4 (pen.) | Friendly |
| September 4 | Stockholm , Sweden | Sweden | 3:4 | Friendly |
| October 16 | Landskrona , Sweden | Faroe Islands | 2:0 | Euro '92 Qualifier |
| October 30 | Varginha , Brazil | Brazil | 1:3 | Friendly |
| November 13 | Vienna , Austria | Austria | 2:0 | Euro '92 Qualifier |
Question:
When is Northern Ireland the opponent?
Answer:
March 27