Are the dates return from the API in GMT or the clients timezone?
EG, a call to get the active subscribers for a list returns the date the subscriber subscribed - would this be in the clients local timezone or in GMT?
Those dates are in the client's timezone.
I've just updated the API docs for getting active, unsubscribed, bounced, and deleted subscribers to clarify that.
You can also get a client's timezone using the API if you need to.
Hope that helps.
That's great, thanks for clearing that up!