[gnome-db] String to timestamp conversion

Hi!

There's some issue with G_TYPE_STRING to GDA_TYPE_TIMESTAMP conversion:

'2011-01-01T00:00:00+00:00' can not be converted to timestamp, though, 
it's valid ISO 8601 datetime.

Also, was there any changes wrt timestamp's timezone?
I could set time offset using gda's timestamp's timezone in 4.0.
In 4.2, it doesn't work any longer.

Piotras