Clear The Last Zync Time
These are the notes for GoZync 3. Docs for the latest version of GoZync--GoZync 4--can be found here. GoZync 4 is a free upgrade and is highly recommended (hint: it's faster).
Clearing the Last Zync Time
Do this by clicking "Reset" in the lower left of GoZyncMobile.
BUT, know that if you're using Field Level Merge under Zync Options, reset will cause you to perform a (slow) first sync on your next sync.