Sorry to be a pain but I am confused. The time in EM *IS* correct on my server - I don't have any problems on the server... the problem appears to be with how the .ics file is interpreted by Google Calendar.
This is an entry in the ics file after daylight savings change:
SUMMARY:Good Friday - NO Friday Night at the Studio Event - Ian's Studio - 6 Apr 12 19:00
As you can see it is being exported as being 19:00 till 22:00. But when Google calendar imports the event it imports as running 20:00 till 23:00.
Looking at the header of the ics file I have the following:
X-WR-CALNAME:Ian's Studio - Calendar
I won't pretend to really understand the ics file format but I would expect to see a TZID tag daylight savings specification to say what timezone the calendar is for and when daylight savings starts.
When the ics is imported into Google calendar a calendar timezone of "GMT+00:00) GMT (no daylight saving)" is set with no way to change this.
Some ics files I've looked at have the following included in in the header seciton:
Nothing like this appears in the ics file generated by EM.