ADD: Add optional chrono feature for date/datetime conversions

Co-authored-by: Claude <[email protected]>

Author: wtn

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## 0.37.0 - TBD
+
+### Enhancements
+- Added optional `chrono` feature for converting `chrono` date and datetime types to
+  `DateRange`, `DateTimeRange`, and `Subscription::start` (credit: @wtn)
+
 ## 0.36.0 - 2025-11-19
 
 ### Enhancements

Cargo.toml

@@ -30,11 +30,13 @@ historical = [
   "tokio/fs"
 ]
 live = ["tokio/net"]
+chrono = ["dep:chrono"]
 
 [dependencies]
 dbn = { version = "0.44.0", features = ["async", "serde"] }
 
 async-compression = { version = "0.4", features = ["tokio", "zstd"], optional = true }
+chrono = { version = ">=0.4.34", optional = true, default-features = false, features = ["alloc"] }
 # Async stream trait
 futures = { version = "0.3", optional = true }
 # Used for Live authentication and historical checksums
@@ -55,6 +57,7 @@ zstd = { version = "0.13", optional = true }
 
 [dev-dependencies]
 anyhow = "1.0.100"
+chrono = { version = ">=0.4.34", default-features = false, features = ["alloc"] }
 async-compression = { version = "0.4", features = ["tokio", "zstd"] }
 clap = { version = "4.5.51", features = ["derive"] }
 rstest = "0.26.1"

README.md

@@ -26,6 +26,7 @@ cargo add databento
 
 - `historical`: enables the historical client for data older than 24 hours
 - `live`: enables the live client for real-time and intraday historical data
+- `chrono`: enables passing `chrono` types as datetime parameters
 
 By default both features are enabled and the historical client uses OpenSSL for TLS.
 To use `rustls`, disable default features for both the databento crate and [reqwest](https://github.com/seanmonstar/reqwest).