time.month() → number
Return the month of a time object as a number between 1 and 12. For your convenience, the terms r.january, r.february etc. are defined and map to the appropriate integer.
Example: Retrieve all the users who were born in November.
r.table("users").filter{ |user|
    user["birthdate"].month().eq(11)
}
  Example: Retrieve all the users who were born in November.
r.table("users").filter{ |user|
    user["birthdate"].month().eq(r.november)
}
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    https://rethinkdb.com/api/ruby/month/