I wonder if it is a leap year issue.... I would be suprised if that site or any other site actually looked at the data. The metars and tafs are fed into the AFTN (or whatever it is now) distribution system by each ICAO contracting state in the specific format and nobody should have any need to decompose them.
Gotta be careful with dates anywhere and anytime and especially on internet dating sites! Been there, tried that!
Actually I'd say that internet dating is a really good way to get a partner who doesn't resent your flying