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/*!
Implementation of the Elasticsearch `date` type.
Dates in Elasticsearch are exposed as a formatted `string` which can contain a `date` and/or a `time` component.
All dates used by `elastic_types` are expected to be given in `Utc`, and if no time is supplied, then 12:00am will be used instead.
Where performance is paramount, the `EpochMillis` date format will parse and format dates the fastest.
# Date types
## `Date<M>`
The `Date<M>` type and `chrono`s `DateTime<Utc>` are the main `date` field types you add to document types.
If the mapping and format aren't important, use `DateTime<Utc>`.
If you need to specify mapping properties like `boost`, or use a specific format like `epoch_millis`, use `Date<M>`.
## `DateValue` and `FormattableDateValue<F>`
The `DateValue` and `FormattableDateValue<F>` types are used in methods to represent dates that either don't have a format or have a specific format respectively.
`Date` and `DateTime<Utc>` can freely convert to and from these types, so you probably won't need to interact with them directly.
# Examples
For defining your own date mapping, see [mapping details](mapping/trait.DateMapping.html#derive-mapping).
Map with a default `date`:
```
# extern crate chrono;
# extern crate elastic_types;
# use elastic_types::prelude::*;
# fn main() {
use chrono::{DateTime, Utc};
struct MyType {
pub field: DateTime<Utc>
}
# }
```
For custom formats, the most ergonomic approach is to declare a type alias using the mapping and format:
```
# use elastic_types::prelude::*;
type Timestamp = Date<DefaultDateMapping<EpochMillis>>;
struct MyType {
pub field: Timestamp
}
```
Map with a custom `date` mapping:
```
# extern crate serde;
# #[macro_use]
# extern crate elastic_types;
# use std::marker::PhantomData;
# use elastic_types::prelude::*;
# fn main() {
# use elastic_types::prelude::*;
# #[derive(Default)]
# struct MyDateMapping;
# impl DateMapping for MyDateMapping { type Format = EpochMillis; }
struct MyType {
pub field: Date<MyDateMapping>
}
# }
```
## Creating Formats
To make it easier to build your own date formats, derive `ElasticDateFormat` on a unit struct.
This will convert an Elasticsearch format string into a `Vec<chrono::format::Item>` for efficient parsing and formatting at runtime:
```
# #[macro_use]
# extern crate elastic_types;
# #[macro_use]
# extern crate elastic_types_derive;
# extern crate chrono;
# use elastic_types::prelude::*;
# fn main() {
#[derive(Default, ElasticDateFormat)]
#[elastic(date_format="yyyy-MM-dd'T'HH:mm:ss")]
struct MyFormat;
# }
```
You can also manually implement `DateFormat` and write your own arbitrary format/parse logic:
```
# extern crate elastic_types;
# extern crate chrono;
# use elastic_types::prelude::*;
# fn main() {
use chrono::{DateTime, Utc};
#[derive(Default, Clone)]
struct Rfc3339Format;
impl DateFormat for Rfc3339Format {
fn name() -> &'static str { "yyyy-MM-dd'T'HH:mm:ssZ" }
fn format<'a>(date: &'a DateValue) -> FormattedDate<'a> {
date.to_rfc3339().into()
}
fn parse(date: &str) -> Result<DateValue, ParseError> {
let date = DateTime::parse_from_rfc3339(date)?;
Ok(DateTime::from_utc(date.naive_local(), Utc).into())
}
}
# }
```
# Links
- [Elasticsearch Doc](https://www.elastic.co/guide/en/elasticsearch/reference/current/date.html)
*/
pub use *;
pub use *;
pub use *;