Hi, I am working on a Cox Regression Model and am having trouble formatting my date to event. I have two variables showing the month of the event (DOD_M) and the year (DOD_Y). The month is formatted as a numeric variable (1-12), and the year is a numeric four digit variable (1995-2018). I would like to eventually create a variable that shows the time to event from enrollment in the study (5/1/1995) to the event, in months. What is the easiest way to do this? Thanks!