Dates and decimals

rydantic = { version = "=0.7.0", features = ["chrono", "decimal"] }

The chrono feature supports NaiveDate, NaiveTime, NaiveDateTime, DateTime<Utc>, and DateTime<FixedOffset>, re-exported through rydantic::chrono. Their formats are YYYY-MM-DD, HH:MM:SS[.fraction], an ISO date-time without a time zone, and RFC 3339 date-times. Validation checks calendar dates, four-digit years, at most nine fractional-second digits, and RFC 3339 time zones. UTC types are converted to UTC. The decimal feature provides rydantic::rust_decimal::Decimal, preserving a 96-bit coefficient and up to 28 fractional digits. Input and output use decimal strings by default and preserve scale; explicit coerce also accepts JSON numbers. Loss of precision fails validation, and range constraints use exact decimal comparisons.

use rydantic::{Model, rust_decimal::Decimal};

#[derive(Debug, Model)]
struct Price {
    #[model(ge = "0.1000000000000000000000000001")]
    amount: Decimal,
}

Date semantics, Decimal precision, and numeric bounds on string representations are marked as schema-local rules. Run cargo run -p rydantic --example dates_decimal --features chrono,decimal for a complete example.

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Dates and decimals