What is the right syntax for "timeframe" in MailChimp API 3.0

Question

I want to use the MailChimp API 3.0:

http://developer.mailchimp.com/documentation/mailchimp/reference/lists/members/#

How do I set the query string parameter for the fields since_timestamp_opt, before_timestamp_opt, since_last_changed and before_last_changed?

Is it a timestamp, something like this: 2016-03-08 17:50:41 or something else?

Can somebody give me an example?

Answer 1

It is 2016-03-08 17:50:41 YYYY-MM-DD hh:mm:ss