Hi Stef,
Current Time in Greenwich means exactly that, its basically DateTime.UtcNow.ToString(), the server is configured at Central Time which during Daylight Savings (ie Summer as you said) is -5, -5 means 5 hours behind Greenwich, Greenwich is like the standard that all time offsets are based on, so all time zones are referenced by their difference + or - vs GMT or Greenwich Mean Time. So Utc (Universal Time Code) is the same thing as GMT.
Note that in .NET 3.5 we have some better TimeZoneInfo class that we could use to automatically adjust the profile time offset druing Daylight Savings, but I am waiting for it to be implemented in Mono before I can use it.
Best,
Joe