What was the date of the race with a winning time of 1:55:13?
CREATE TABLE "table1_17801022_1" (
  "year" real,
  "date" text,
  "driver" text,
  "manufacturer" text,
  "laps" real,
  "miles_km" text,
  "race_time" text,
  "average_speed_mph" text
);
SELECT "date" FROM "table1_17801022_1" WHERE "race_time"='1:55:13';