Newly released into FeedBlitz, a new custom field type to hold dates. You can use this custom field like any other, such as making it public (so they enter, say, their birthday on your subscription form), or you can make it private (such as their last purchase date). Date custom fields have a handy little popup calendar to help make data entry easier, as in the screenshot below.

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.