The AccountExpires property specifies when the account will expire. This value is calculated from the number of seconds elapsed ...

The AccountExpires property specifies when the account will expire. This value is calculated from the number of seconds elapsed since 00:00:00, January 1, 1970, and is set in this format: yyyymmddhhmmss.mmmmmm sutc.
Example: 20521201000230.000000 000