Problem in time zone sync with google account

I am having problems with time zone and Google account.

My schedules in the calendar always has 1 hour earlier in Google.

If I schedule 10:00am at eMClient, in Google I have 09:00am.

I checked and my computer has time zone UTC -3:00 and Google the same.

What can I do to fix this problem?

eMClient 6.0.19861.0
Windows 8
Firefox 27