Chrono support

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
     - run: rustup show active-toolchain -v
     - run: cargo build
     - run: cargo build --no-default-features
-    - run: cargo build --features uuid,time
+    - run: cargo build --features uuid,time,chrono
     - run: cargo build --all-features
 
   rustfmt:

Cargo.toml

@@ -51,7 +51,7 @@ required-features = ["rustls-tls"]
 
 [[example]]
 name = "data_types_derive_simple"
-required-features = ["time", "uuid"]
+required-features = ["time", "uuid", "chrono"]
 
 [[example]]
 name = "data_types_variant"
@@ -69,17 +69,29 @@ watch = ["dep:sha-1", "dep:serde_json", "serde/derive"]
 uuid = ["dep:uuid"]
 time = ["dep:time"]
 lz4 = ["dep:lz4_flex", "dep:cityhash-rs"]
-
+chrono = ["dep:chrono"]
 ##  TLS
 native-tls = ["dep:hyper-tls"]
 # ext: native-tls-alpn
 # ext: native-tls-vendored
 
 rustls-tls = ["rustls-tls-aws-lc", "rustls-tls-webpki-roots"]
-rustls-tls-aws-lc = ["dep:rustls", "dep:hyper-rustls", "hyper-rustls?/aws-lc-rs"]
+rustls-tls-aws-lc = [
+    "dep:rustls",
+    "dep:hyper-rustls",
+    "hyper-rustls?/aws-lc-rs",
+]
 rustls-tls-ring = ["dep:rustls", "dep:hyper-rustls", "hyper-rustls?/ring"]
-rustls-tls-webpki-roots = ["dep:rustls", "dep:hyper-rustls", "hyper-rustls?/webpki-tokio"]
-rustls-tls-native-roots = ["dep:rustls", "dep:hyper-rustls", "hyper-rustls?/native-tokio"]
+rustls-tls-webpki-roots = [
+    "dep:rustls",
+    "dep:hyper-rustls",
+    "hyper-rustls?/webpki-tokio",
+]
+rustls-tls-native-roots = [
+    "dep:rustls",
+    "dep:hyper-rustls",
+    "hyper-rustls?/native-tokio",
+]
 
 [dependencies]
 clickhouse-derive = { version = "0.2.0", path = "derive" }
@@ -110,6 +122,7 @@ lz4_flex = { version = "0.11.3", default-features = false, features = [
 cityhash-rs = { version = "=1.0.1", optional = true } # exact version for safety
 uuid = { version = "1", optional = true }
 time = { version = "0.3", optional = true }
+chrono = { version = "0.4", optional = true, features = ["serde"] }
 bstr = { version = "1.11.0", default-features = false }
 quanta = { version = "0.12", optional = true }
 replace_with = { version = "0.1.7" }

README.md

@@ -224,6 +224,7 @@ See [examples](https://github.com/ClickHouse/clickhouse-rs/tree/main/examples).
 * `watch` — enables `client.watch` functionality. See the corresponding section for details.
 * `uuid` — adds `serde::uuid` to work with [uuid](https://docs.rs/uuid) crate.
 * `time` — adds `serde::time` to work with [time](https://docs.rs/time) crate.
+* `chrono` — adds `serde::chrono` to work with [chrono](https://docs.rs/chrono) crate.
 
 ### TLS
 By default, TLS is disabled and one or more following features must be enabled to use HTTPS urls:
@@ -328,7 +329,9 @@ How to choose between all these features? Here are some considerations:
     }
     ```
     </details>
-* `Date` maps to/from `u16` or a newtype around it and represents a number of days elapsed since `1970-01-01`. Also, [`time::Date`](https://docs.rs/time/latest/time/struct.Date.html) is supported by using `serde::time::date`, that requires the `time` feature.
+* `Date` maps to/from `u16` or a newtype around it and represents a number of days elapsed since `1970-01-01`. The following external types are supported: 
+    * [`time::Date`](https://docs.rs/time/latest/time/struct.Date.html) is supported by using `serde::time::date`, requiring the `time` feature. 
+    * [`chrono::NaiveDate`](https://docs.rs/chrono/latest/chrono/struct.NaiveDate.html) is supported by using `serde::chrono::date`, requiring the `chrono` feature. 
     <details>
     <summary>Example</summary>
 
@@ -338,10 +341,16 @@ How to choose between all these features? Here are some considerations:
         days: u16,
         #[serde(with = "clickhouse::serde::time::date")]
         date: Date,
+        // if you prefer using chrono:
+        #[serde(with = "clickhouse::serde::chrono::date")]
+        date_chrono: NaiveDate,
     }
+
     ```
     </details>
-* `Date32` maps to/from `i32` or a newtype around it and represents a number of days elapsed since `1970-01-01`. Also, [`time::Date`](https://docs.rs/time/latest/time/struct.Date.html) is supported by using `serde::time::date32`, that requires the `time` feature.
+* `Date32` maps to/from `i32` or a newtype around it and represents a number of days elapsed since `1970-01-01`. The following external types are supported: 
+    * [`time::Date`](https://docs.rs/time/latest/time/struct.Date.html) is supported by using `serde::time::date32`, requiring the `time` feature. 
+    * [`chrono::NaiveDate`](https://docs.rs/chrono/latest/chrono/struct.NaiveDate.html) is supported by using `serde::chrono::date32`, requiring the `chrono` feature. 
     <details>
     <summary>Example</summary>
 
@@ -351,10 +360,17 @@ How to choose between all these features? Here are some considerations:
         days: i32,
         #[serde(with = "clickhouse::serde::time::date32")]
         date: Date,
+        // if you prefer using chrono:
+        #[serde(with = "clickhouse::serde::chrono::date32")]
+        date_chrono: NaiveDate,
+
     }
+
     ```
     </details>
-* `DateTime` maps to/from `u32` or a newtype around it and represents a number of seconds elapsed since UNIX epoch. Also, [`time::OffsetDateTime`](https://docs.rs/time/latest/time/struct.OffsetDateTime.html) is supported by using `serde::time::datetime`, that requires the `time` feature.
+* `DateTime` maps to/from `u32` or a newtype around it and represents a number of seconds elapsed since UNIX epoch. The following external types are supported:
+    * [`time::OffsetDateTime`](https://docs.rs/time/latest/time/struct.OffsetDateTime.html) is supported by using `serde::time::datetime`, requiring the `time` feature. 
+    * [`chrono::DateTime<Utc>`](https://docs.rs/chrono/latest/chrono/struct.DateTime.html) is supported by using `serde::chrono::datetime`, requiring the `chrono` feature. 
     <details>
     <summary>Example</summary>
 
@@ -364,10 +380,15 @@ How to choose between all these features? Here are some considerations:
         ts: u32,
         #[serde(with = "clickhouse::serde::time::datetime")]
         dt: OffsetDateTime,
+        // if you prefer using chrono:
+        #[serde(with = "clickhouse::serde::chrono::datetime")]
+        dt_chrono: DateTime<Utc>,        
     }
     ```
     </details>
-* `DateTime64(_)` maps to/from `i64` or a newtype around it and represents a time elapsed since UNIX epoch. Also, [`time::OffsetDateTime`](https://docs.rs/time/latest/time/struct.OffsetDateTime.html) is supported by using `serde::time::datetime64::*`, that requires the `time` feature.
+* `DateTime64(_)` maps to/from `i64` or a newtype around it and represents a time elapsed since UNIX epoch. The following external types are supported:
+    * [`time::OffsetDateTime`](https://docs.rs/time/latest/time/struct.OffsetDateTime.html) is supported by using `serde::time::datetime64::*`, requiring the `time` feature. 
+    * [`chrono::DateTime<Utc>`](https://docs.rs/chrono/latest/chrono/struct.DateTime.html) is supported by using `serde::chrono::datetime64::*`, requiring the `chrono` feature. 
     <details>
     <summary>Example</summary>
 
@@ -383,7 +404,18 @@ How to choose between all these features? Here are some considerations:
         dt64us: OffsetDateTime, // `DateTime64(6)`
         #[serde(with = "clickhouse::serde::time::datetime64::nanos")]
         dt64ns: OffsetDateTime, // `DateTime64(9)`
+        // if you prefer using chrono:
+        #[serde(with = "clickhouse::serde::chrono::datetime64::secs")]
+        dt64s_chrono: DateTime<Utc>,  // `DateTime64(0)`
+        #[serde(with = "clickhouse::serde::chrono::datetime64::millis")]
+        dt64ms_chrono: DateTime<Utc>, // `DateTime64(3)`
+        #[serde(with = "clickhouse::serde::chrono::datetime64::micros")]
+        dt64us_chrono: DateTime<Utc>, // `DateTime64(6)`
+        #[serde(with = "clickhouse::serde::chrono::datetime64::nanos")]
+        dt64ns_chrono: DateTime<Utc>, // `DateTime64(9)`
     }
+
+
     ```
     </details>
 * `Tuple(A, B, ...)` maps to/from `(A, B, ...)` or a newtype around it.

examples/data_types_derive_simple.rs

@@ -1,14 +1,14 @@
 use std::str::FromStr;
 
-use fixnum::typenum::{U12, U4, U8};
-use fixnum::FixedPoint;
-use rand::distributions::Alphanumeric;
-use rand::seq::SliceRandom;
-use rand::Rng;
+use chrono::{DateTime, NaiveDate, Utc};
+use fixnum::{
+    typenum::{U12, U4, U8},
+    FixedPoint,
+};
+use rand::{distributions::Alphanumeric, seq::SliceRandom, Rng};
 use time::{Date, Month, OffsetDateTime, Time};
 
-use clickhouse::sql::Identifier;
-use clickhouse::{error::Result, Client};
+use clickhouse::{error::Result, sql::Identifier, Client};
 
 // This example covers derivation of _simpler_ ClickHouse data types.
 // See also: https://clickhouse.com/docs/en/sql-reference/data-types
@@ -121,23 +121,42 @@ pub struct Row {
     pub decimal64_18_8: Decimal64,
     pub decimal128_38_12: Decimal128,
     #[serde(with = "clickhouse::serde::time::date")]
-    pub date: Date,
+    pub time_date: Date,
     #[serde(with = "clickhouse::serde::time::date32")]
-    pub date32: Date,
+    pub time_date32: Date,
     #[serde(with = "clickhouse::serde::time::datetime")]
-    pub datetime: OffsetDateTime,
+    pub time_datetime: OffsetDateTime,
     #[serde(with = "clickhouse::serde::time::datetime")]
-    pub datetime_tz: OffsetDateTime,
+    pub time_datetime_tz: OffsetDateTime,
     #[serde(with = "clickhouse::serde::time::datetime64::secs")]
-    pub datetime64_0: OffsetDateTime,
+    pub time_datetime64_0: OffsetDateTime,
     #[serde(with = "clickhouse::serde::time::datetime64::millis")]
-    pub datetime64_3: OffsetDateTime,
+    pub time_datetime64_3: OffsetDateTime,
     #[serde(with = "clickhouse::serde::time::datetime64::micros")]
-    pub datetime64_6: OffsetDateTime,
+    pub time_datetime64_6: OffsetDateTime,
     #[serde(with = "clickhouse::serde::time::datetime64::nanos")]
-    pub datetime64_9: OffsetDateTime,
+    pub time_datetime64_9: OffsetDateTime,
     #[serde(with = "clickhouse::serde::time::datetime64::nanos")]
-    pub datetime64_9_tz: OffsetDateTime,
+    pub time_datetime64_9_tz: OffsetDateTime,
+
+    #[serde(with = "clickhouse::serde::chrono::date")]
+    pub chrono_date: NaiveDate,
+    #[serde(with = "clickhouse::serde::chrono::date32")]
+    pub chrono_date32: NaiveDate,
+    #[serde(with = "clickhouse::serde::chrono::datetime")]
+    pub chrono_datetime: DateTime<Utc>,
+    #[serde(with = "clickhouse::serde::chrono::datetime")]
+    pub chrono_datetime_tz: DateTime<Utc>,
+    #[serde(with = "clickhouse::serde::chrono::datetime64::secs")]
+    pub chrono_datetime64_0: DateTime<Utc>,
+    #[serde(with = "clickhouse::serde::chrono::datetime64::millis")]
+    pub chrono_datetime64_3: DateTime<Utc>,
+    #[serde(with = "clickhouse::serde::chrono::datetime64::micros")]
+    pub chrono_datetime64_6: DateTime<Utc>,
+    #[serde(with = "clickhouse::serde::chrono::datetime64::nanos")]
+    pub chrono_datetime64_9: DateTime<Utc>,
+    #[serde(with = "clickhouse::serde::chrono::datetime64::nanos")]
+    pub chrono_datetime64_9_tz: DateTime<Utc>,
 }
 
 // See ClickHouse decimal sizes: https://clickhouse.com/docs/en/sql-reference/data-types/decimal
@@ -206,15 +225,25 @@ impl Row {
             // See
             // - https://clickhouse.com/docs/en/sql-reference/data-types/date
             // - https://clickhouse.com/docs/en/sql-reference/data-types/date32
-            date: Date::from_calendar_date(2149, Month::June, 6).unwrap(),
-            date32: Date::from_calendar_date(2299, Month::December, 31).unwrap(),
-            datetime: max_datetime(),
-            datetime_tz: max_datetime(),
-            datetime64_0: max_datetime64(),
-            datetime64_3: max_datetime64(),
-            datetime64_6: max_datetime64(),
-            datetime64_9: max_datetime64_nanos(),
-            datetime64_9_tz: max_datetime64_nanos(),
+            time_date: Date::from_calendar_date(2149, Month::June, 6).unwrap(),
+            time_date32: Date::from_calendar_date(2299, Month::December, 31).unwrap(),
+            time_datetime: max_datetime(),
+            time_datetime_tz: max_datetime(),
+            time_datetime64_0: max_datetime64(),
+            time_datetime64_3: max_datetime64(),
+            time_datetime64_6: max_datetime64(),
+            time_datetime64_9: max_datetime64_nanos(),
+            time_datetime64_9_tz: max_datetime64_nanos(),
+
+            chrono_date: NaiveDate::from_ymd_opt(2149, 6, 6).unwrap(),
+            chrono_date32: NaiveDate::from_ymd_opt(2299, 12, 31).unwrap(),
+            chrono_datetime: Utc::now(),
+            chrono_datetime_tz: Utc::now(),
+            chrono_datetime64_0: Utc::now(),
+            chrono_datetime64_3: Utc::now(),
+            chrono_datetime64_6: Utc::now(),
+            chrono_datetime64_9: Utc::now(),
+            chrono_datetime64_9_tz: Utc::now(),
         }
     }
 }