Overview #MsDS-UserPasswordExpiryTimeComputed Virtual Attribute Attribute indicates the time in LargeInteger Date format when the password of the entry will expire. 
MsDS-UserPasswordExpiryTimeComputed performs the AD Determining Password Expiration calculations.
If USER is the Entry on which the attribute msDS-UserPasswordExpiryTimeComputed is read.
If USER is not in a domain NC, then USER:msDS-UserPasswordExpiryTimeComputed = null.
If DC is the root of the domain NC containing USER. The DC applies the following rules, in the order specified below, to determine the value of USER:msDS-UserPasswordExpiryTimeComputed: If any of the following are set bits is set on USER entry:User-Account-Control Attribute:
If pwdLastSet = null or pwdLastSet = 0, #then USER:msDS-UserPasswordExpiryTimeComputed = 0.
if Effective-MaximumPasswordAge = 0x8000000000000000 #then USER:msDS-UserPasswordExpiryTimeComputed = 0x7FFFFFFFFFFFFFFF (where Effective-MaximumPasswordAge is defined in MS-SAMR section 188.8.131.52).
- msDS-UserPasswordExpiryTimeComputed = USER:pwdLastSet + Effective-MaximumPasswordAge (where Effective-MaximumPasswordAge is defined in MS-SAMR section 184.108.40.206).