Try this:

=TEXT(RIGHT(A1,2)&"-1","mmm-")&MID(A1,2,2)


"Rick Rothstein (MVP - VB)" wrote:

One of our databases churns out a 5 digit date such as 10410 is
October 2004. The 1st 3 characters indicate the year (e.g., 107 is
2007, 106 is 2006, etc) and the last 2 characters indicate the month.

Is there a custom date format that would make it easier to read, and
have the result appear to be:
Apr-07, or the like?

A1: 10410

B1: =TEXT(RIGHT(A1,2),"mmm-")&MID(A1,2,2)

Rick