You should follow ISO-8601 rules for displaying temporal data This is the only format allowed in ANSI/ISO Standard SQL and the other ISO standards. It is also why we database people make fun of you guys who speak in a hillbilly date dialect (https://xkcd.com/1179/).
Also, never use the old Sybase CONVERT() string function. We put it in the early Sybase SQL products to help COBOL programmers whose language lacked temporal data types and had to use strings. The concept of a tiered architecture was brand new back them, but this is 2016!