title: change ID number format of number to date format
body: <p>I would like to write an ID number from this format YYMMDDXXXXXXX to this 19YY-MM-DD or 20YY-MM-DD in sql.</p>
  <pre><code>select Customer_identifier from  MartDB.DBO.BAW_AllSources_Stage1_202005
  </code></pre>
  <p>Customer_identifier cexample is 8801213535353 where 88 represents year of birth 1988, 01 represents month of birth January, 21 represents day of birth the 21st.  21 Jan 1988.  I want to convert that to a date 1988-01-21</p>