changelog should be complete

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 - New `UnixTimestamp` abstraction which contains the unix seconds as an `i64`
   and an optional subsecond millisecond counter (`u16`)
+- `MS_PER_DAY` constant.
 
 ### CDS time module
 
@@ -20,22 +21,35 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
   and subsecond milliseconds).
 - `MAX_DAYS_24_BITS` which contains maximum value which can be supplied
   to the days field of a CDS time provider with 24 bits days field width.
-- New `CdsTimestamp` trait which encapsulates common fields for all CDS time providers
+- New `CdsTimestamp` trait which encapsulates common fields for all CDS time providers.
 - `get_dyn_time_provider_from_bytes`: Requires `alloc` support and returns
    the correct `TimeProvider` instance wrapped as a boxed trait object
    `Box<DynCdsTimeProvider>` by checking the length of days field.
-- `from_unix_secs_with_u24_days` and `from_unix_secs_with_u16_days`
+- `from_unix_secs_with_u24_days` and `from_unix_secs_with_u16_days` which create
+   the time provider from a `UnixTimestamp` reference.
+- `from_dt_with_u16_days`, `from_dt_with_u24_days` and their `..._us_precision` and
+   `..._ps_precision` variants which allow to create time providers from
+   a `chrono::DateTime<Utc>`.
+- Add `from_bytes_with_u24_days` and `from_bytes_with_u16_days` associated methods
+- Implement `Add<Duration>` and `AddAssign<Duration>` for time providers, which allows
+  easily adding offsets to the providers.
+- Implement `TryFrom<DateTime<Utc>>` for time providers.
+
 ## Changed
 
+- (breaking): Renamed `from_now_with_u24_days_and_us_prec` to `from_now_with_u24_days_us_precision`.
+  Also did the same for the `u16` variant.
+- (breaking): Renamed `from_now_with_u24_days_and_ps_prec` to `from_now_with_u24_days_ps_precision`.
+  Also did the same for the `u16` variant.
 - `CcsdsTimeProvider` trait (breaking):
-  - Add new `unix_stamp` method returning the new `UnixTimeStamp` struct
-  - Add new  `subsecond_millis` method returning counter `Option<u16>`
+  - Add new `unix_stamp` method returning the new `UnixTimeStamp` struct.
+  - Add new  `subsecond_millis` method returning counter `Option<u16>`.
   - Default impl for `unix_stamp` which re-uses `subsecond_millis` and
-    existing `unix_seconds` method
+    existing `unix_seconds` method.
 - `TimestampError` (breaking): Add `DateBeforeCcsdsEpoch` error type
   because new CDS API allow supplying invalid date times before CCSDS epoch.
   Make `TimestampError` with `#[non_exhaustive]` attribute to prevent
-  future breakages if new error variants are added
+  future breakages if new error variants are added.
 
 # [v0.4.2] 14.01.2023
 

src/time/mod.rs

@@ -292,6 +292,13 @@ impl UnixTimestamp {
         }
         secs
     }
+
+    pub fn as_date_time(&self) -> LocalResult<DateTime<Utc>> {
+        Utc.timestamp_opt(
+            self.unix_seconds,
+            self.subsecond_millis.unwrap_or(0) as u32 * 10_u32.pow(6),
+        )
+    }
 }
 
 impl From<DateTime<Utc>> for UnixTimestamp {