This seems like it may be ISO 8601 formatted.
The ISO 8601 format is: YYYY-MM-DD.
So value of 20230118000000 would become: 2023-01-18.
The trailing six zeros are your time value. The zeros are simply there because there's not a specified time value with your data.
Normally the formatting of the time would go: YYYY-MM-DD T HH:MM:SSZ.
And of course, the [-6:CST] is just your timezone.