Teresa of Ávila died just as the Gregorian Calendar was being adopted near midnight of 4th of October 1582 or early the next morning on the 15th of October 1582. Her feast day is presently celebrated on the 15th of October because there was no 5th of October 1582 in those countries which adopted the Gregorian calendar reform.
Her last words were: “My Lord, it is time to move on. Well then, may your will be done. O My Lord and my Spouse, the hour that I have longed for has come. It is time to meet one another.”