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 | Tournament | Winning score | Margin of victory | Runner(s)-up |
| --- | --- | --- | --- | --- |
| May 22, 1994 | Memorial Tournament | −20 (67-67-67-67=268) | 5 strokes | Greg Norman |
| May 12, 1995 | Colonial National Invitation | −9 (67-68-68-68=271) | 1 stroke | Craig Parry |
| Jul 21, 1996 | The Open Championship | −13 (67-67-64-73=271) | 2 strokes | Ernie Els , Mark McCumber |
| Oct 28, 1996 | The Tour Championship | −12 (66-67-64-71=268) | 7 strokes | Steve Stricker |
| Jan 30, 2000 | Phoenix Open | −14 (63-67-73-67=270) | 1 stroke | Robert Allenby , Rocco Mediate |
Question:
What day was the margin of victory 1 stroke when the tournament was colonial national invitation?
Answer:
May 12, 1995