I have setup my calendar time zone to -05:00 EST: Montreal and the plugin with -05:00 EST and setup 17:00 arrival and 12:00 departure.

When I have a new reservation the time show 18:00 arrival and 13:00 departure.

Does it has to do with daylight saving time ?

Thanks

After a few tests on my own, in my own timezone, I realized you are correct. So I searched Google for similar people who experienced similar issues. Google pages are full of posts related to google calendar timezone issues (that + 1 hour, and others). They will probably be fixed soon. In the mean time, there`s nothing I can do, except recommend you to try adjusting the hour in Google Calendar Integrator plugin settings to -1 (16:00 arrival and 11:00 departure) so it will show the start/end hours correctly in the calendar (17:00 arrival and 12:00 departure).

The hour offset problem appears to have been 'fixed' in Google.

I have my required hours set in the Jomres 'backend' for the Integrator and they have been appearing correctly for a few weeks now in my Outlook Calendar (via Google Calendar and Sync2).

Excellent, that`s good news