This knowledge base article explains how to synchronize the PwdLastSet time from Active Directory to OneLogin.
Note: you must be running ADC version 5.1.4 or newer, and you must remote in to each system.
Remote in to each system and perform the following steps in sequence.

Insert a new line above the and paste in the following lines, ensuring you begin and end each line with < and end with >:
setting name="SpecialDirectoryAttributes" serializeAs="Xml"
value
DirectoryAttributeFormatCollection xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"
DirectoryAttributeFormat Name="pwdLastSet" Syntax="Int64" Format="DateTime" FormatStyle="yyyy-MM-ddThh:mm:ss.fffZ" /
/DirectoryAttributeFormatCollection
/value
/setting



Note: The short name you copied to your clipboard is pasted after the prefix {custom_attribute} and ended with the right curly-brace.

When you click save it will sync and update all your users and the mappings will instantly update any users that have unsynchronized or disparate password last changed times.