I have Stata SE 15.1 and I noticed Stata does not convert 2/29/2011 to a date value. When I run:

Code:
scalar x1=mdy(2,28,2011)
scalar x2=mdy(2,29,2011)
dis  x1 ", " x2
It returns18686 for 2/28/2011 and a missing value for 2/29/2011. Anyone else has this problem?