Fix Windows Installed Date

Must do create a user defined variable which can only be done using the
'/global' option currently instead of doing a constant so that a
StrCpy() can be done against the data returned from GetTime().

Previously, the data in the shared variables ($0, $1, etc) had the
potential to change which would also change what was getting stored in
CURRENTTIME. Doing the StrCpy() fixes this issue.