Is there any news on this issue? I’m experiencing something similar.
I have a channel for our events, that has a custom field for the actual date of the event itself - using eevent helper, it sets the expiry for midnight the day of the event so that it clears away off our site.
I noticed that whenever I go back to edit an entry - even with eevent helper turned off - it pushes the event time (but not the entry time) forward one hour. With eevent helper turned on, it will push it forward by two hours. When eevent helper is turned off, it only starts pushing the entries ahead by one hour after March DST, even though everything on my site has it turned off (both member profile & localization setting).
But it’s not that it just pushes it ahead one hour on the site - it cumulatively adds an hour every time someone saves an edit - this is viewable from the entry preview after I hit ‘save’.