async-graphql 1.16.0

A GraphQL server library implemented in Rust
Documentation 
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use crate::{InputValueError, InputValueResult, ScalarType, Value};
use async_graphql_derive::Scalar;
use chrono::NaiveDate;

#[Scalar(internal)]
impl ScalarType for NaiveDate {
    fn parse(value: Value) -> InputValueResult<Self> {
        match value {
            Value::String(s) => Ok(NaiveDate::parse_from_str(&s, "%Y-%m-%d")?),
            _ => Err(InputValueError::ExpectedType(value)),
        }
    }

    fn to_value(&self) -> Value {
        Value::String(self.format("%Y-%m-%d").to_string())
    }
}