Hi all,
This is just in case someone needs this information in the future (I needed it yesterday).
After a bit of testing, I'm 99.99% sure that the values of the Timestamp field in IIF files exported from quickbooks is the number of seconds elapsed since 12/31/1969 at 8:00pm.
Hope this helps!
Alex
PS: If you need to email me, remove the animal from the email address above.