PropertyHandle :: GetDateTime - Get property instance as timestamp (date/time)
The function returns the date/time value for the current property handle or for the attribute passed in prop_path.
Return value:  Date time value ( dttm  )
Implementation overview
-  - internal feature (not documented)
 PropertyHandle :: GetDateTime (  )
-  - internal feature (not documented)
 PropertyHandle :: GetDateTime ( sprop_path )
Implementation details
- to list
- 
- internal feature (not documented)
 dttm PropertyHandle  :: GetDateTime ( NString &sprop_path )
 - sprop_path
 - Simple property path
A property path is passed as 0-terminated string. It may contain an extent or property name but also a sequence of property names separated by dot. A simple property path must not contain parentheses or preceding dots. 
 to list
- sprop_path
 - Simple property path

