If you create a field for birthday, say, you can (for example) create a segment that pulls out people born before 1990 like this:
birthday<"1990-01-01"
If you play with this or any custom field feature (Newsletters - Custom fields in version three, Publisher Tools in v4), you will notice that we've added some more "system" custom fields that - interestingly and not at all coincidentally - happen to be date fields. They are Opened, Clicked, Joined and OptedIn.
Intriguing, huh? More on these tomorrow.
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