Um, I think a post on Wattpad is hardly enough to be considered official information and it's clearly fanmade. None of the official sites or games give this information about Haruka, besides September 15 is Ringo's birthday you'd think they'd mentioned it at the very least in his route that they share a birthday. Like most otome heroines she's not supposed to have those. I will have them removed.
She doesn't have a birthday. It's common in otome games for the heroine to not have some of the information so that the player can easily step into her shoes while playing. So that's why her birthday, height and blood type are missing from her profiles in all official sites.