User blog comment:Omega natsu2/...One Year Has Gone By/@comment-1776824-20150127152639/@comment-7418318-20150127163757

It was Lucy who did the ass-kicking until Obra interfered from outside the arena...

While her birthday might be the 1st July, technically she's still only 17 years and six month (on the 1st July X791) once you take the time spent in the Fairy Sphere and Celestial Spirit World away. If we don't count the years they spent frozen, I don't think we should count the month' either.