Are you creating a new restore point or trying to restore to an old one? There's a button choice menu on the first screen where you select one of those options (there is a third one, too)
If you are creating a restore point then it is for "now" and shouldn't be asking you for a date to fill in. If you are trying to rstore to an old saved point, maybe the March one is all you have (though that does sound odd).
Just random thoughts.