Insert Json Content Date Casting Problem

[Saeed Tabrizi]

Hi ,
I want to insert  json data in a class in my db . but i got an error about casting string to date :(
My query is :

 insert into cluster:RFUA Content {'Firstname':'Sample','Lastname':'SAMPLE','Birthday':'2015-03-14T20:30:00.000Z','Gender':'M','Mobile':'95855855885'}

The Birthday type is date and other properties are type of string .

Is it ok?
please help me

Regards .