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Minor DateTime intro doc update 

• Put timezone in the lede since it's critical.
• Mention Instant and SystemTime to put DateTime in context
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John Heitmann 2016-06-13 21:20:21 -07:00 committed by GitHub
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README.md
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@ -53,9 +53,18 @@ provided by crates.io `time` crate (which originally comes from Chrono).
### Date and Time
Chrono provides a `DateTime` type for the combined date and time.
Chrono provides a
[`DateTime`](https://lifthrasiir.github.io/rust-chrono/chrono/datetime/struct.DateTime.html)
type to represent a date and a time in a timezone.
`DateTime`, among others, is timezone-aware and must be constructed from
For more abstract moment-in-time tracking such as internal timekeeping
that is unconcerned with timezones, consider
[`time::SystemTime`](https://doc.rust-lang.org/std/time/struct.SystemTime.html),
which tracks your system clock, or
[`time::Instant`](https://doc.rust-lang.org/std/time/struct.Instant.html), which
is an opaque but monotonically-increasing representation of a moment in time.
`DateTime` is timezone-aware and must be constructed from
the `TimeZone` object.
`DateTime`s with different time zones do not mix, but can be converted to
each other using the `DateTime::with_timezone` method.