Convert epoch time in Sync editor


I would like to get data about Expiry date from AD - parameter msDS-UserPasswordExpiryTimeComputed

As I checked it is the same forma as AccountExpires parameter.

Where I do not find solution is how can I create vrt property to transfer this number to Date and Time. with accountExpires there is Change the schema property of type "Value converter", but I can not find a way to use this converter script  (LargeIntToDateConverter)

Where did I miss this connection? Many thanks for pointing me to the right direction.