To be honest, i have no idea how date works in JSON.
I mean, as an example:
"created_at":{"n":236133000,"s":1445010595,"json_class":"Time"}
How does this translates into 2015-10-16 is a mystery.
If i'll have some spare time to make this work, i will. Otherwise you'll have to live with year tags in "tags".
I can copy year (only) from "tags" to the "date" if you want.