Although it is an old post, maybe this image will help as it is more explicit:
(For phpMyAdmin users)
This configuration sets that field with a value like:
2015-12-11 07:50:47
PS: Note that the timestamp will set the time OF your server!! (i.e. the example above got the time from Pacific Time (07:50:47) but it could have been from a Spanish user at 16:50:47 local time) Keep this in mind.
Also, if you already have a "Created Date" you might need another column that updates the modification date whenever there is an update:
You only need to set on update CURRENT TIME STAMP in Attributes Field.
Ready to rock!
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