I have the same problem addressed in these topics:
(when resaving/updating an event, the dates of both the Event tickets and datetimes change by 7 hours each time I resave the event)
I found my conflicting plugin to be WP-Statistics
I contacted the developers of this plugin and they say:
I would suggest you talk to the other plugin developer, date_default_timezone_set() is a commonly used function and they should not have an issue with us using it.
All times/dates are then calculated based on UTC and the offset is calculated based on the timezone you set within WP settings.
Setting the default timezone to a timezone other than UTC will have unexpected results with not just Event Espresso but any plugin that correctly uses date and times within WordPress. It is more evident within Event Espresso than some other plugins due to the fact that everything revolves around dates.
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