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Added "Converting a formatted date to a Unix timestamp and vice versa" recipe

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Added "Converting a formatted date to a Unix timestamp and vice versa" recipe
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Pawel Duzinkiewicz 2017-11-16 13:43:08 +01:00 committed by Michał Budzyński
parent 3b1a4f5f94
commit e668fff733
2 changed files with 36 additions and 0 deletions
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34
src/basics.md
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@ -27,6 +27,7 @@
| [Check number of logical cpu cores][ex-check-cpu-cores] | [![num_cpus-badge]][num_cpus] | [![cat-hardware-support-badge]][cat-hardware-support] |
| [Obtain backtrace of complex error scenarios][ex-error-chain-backtrace] | [![error-chain-badge]][error-chain] | [![cat-rust-patterns-badge]][cat-rust-patterns] |
| [Measure elapsed time][ex-measure-elapsed-time] | [![std-badge]][std] | [![cat-time-badge]][cat-time] |
| [Convert date to UNIX timestamp and vice versa][ex-convert-datetime-timestamp] | [![chrono-badge]][chrono] | [![cat-date-and-time-badge]][cat-date-and-time] |
| [Convert a local time to an another UTC timezone and vice versa][ex-convert-datetime-timezone] | [![chrono-badge]][chrono] | [![cat-date-and-time-badge]][cat-date-and-time] |
| [Display formatted date and time][ex-format-datetime] | [![chrono-badge]][chrono] | [![cat-date-and-time-badge]][cat-date-and-time] |
| [Parse string into DateTime struct][ex-parse-datetime] | [![chrono-badge]][chrono] | [![cat-date-and-time-badge]][cat-date-and-time] |
@ -1294,6 +1295,34 @@ fn main() {
}
```
[ex-convert-datetime-timestamp]: #ex-convert-datetime-timestamp
<a name="ex-convert-datetime-timestamp"></a>
## Convert date to UNIX timestamp and vice versa
[![chrono-badge]][chrono] [![cat-date-and-time-badge]][cat-date-and-time]
Converts a date given by [`NaiveDate::from_ymd`] and [`NaiveTime::from_hms`]
to [UNIX timestamp] using [`NaiveDateTime::timestamp`].
Then it calculates what was the date after one billion seconds
since January 1, 1970 0:00:00 UTC, using [`NaiveDateTime::from_timestamp`].
```rust
extern crate chrono;
use chrono::{NaiveDate, NaiveDateTime};
fn main() {
let date_time: NaiveDateTime = NaiveDate::from_ymd(2017, 11, 12).and_hms(17, 33, 44);
println!(
"Number of seconds between 1970-01-01 00:00:00 and {} is {}.",
date_time, date_time.timestamp());
let date_time_after_a_billion_seconds = NaiveDateTime::from_timestamp(1_000_000_000, 0);
println!(
"Date after a billion seconds since 1970-01-01 00:00:00 was {}.",
date_time_after_a_billion_seconds);
}
```
[ex-format-datetime]: #ex-format-datetime
<a name="ex-format-datetime"></a>
## Display formatted date and time
@ -1497,8 +1526,12 @@ fn main() {
[`Mutex`]: https://doc.rust-lang.org/std/sync/struct.Mutex.html
[`MutexGuard`]: https://doc.rust-lang.org/std/sync/struct.MutexGuard.html
[`NaiveDate`]: https://docs.rs/chrono/*/chrono/naive/struct.NaiveDate.html
[`NaiveDate::from_ymd`]: https://docs.rs/chrono/*/chrono/naive/struct.NaiveDate.html#method.from_ymd
[`NaiveDateTime`]: https://docs.rs/chrono/*/chrono/naive/struct.NaiveDateTime.html
[`NaiveDateTime::from_timestamp`]: https://docs.rs/chrono/*/chrono/naive/struct.NaiveDateTime.html#method.from_timestamp
[`NaiveDateTime::timestamp`]: https://docs.rs/chrono/*/chrono/naive/struct.NaiveDateTime.html#method.timestamp
[`NaiveTime`]: https://docs.rs/chrono/*/chrono/naive/struct.NaiveTime.html
[`NaiveTime::from_hms`]: https://docs.rs/chrono/*/chrono/naive/struct.NaiveTime.html#method.from_hms
[`Normal`]: https://doc.rust-lang.org/rand/rand/distributions/normal/struct.Normal.html
[`num_cpus::get`]: https://docs.rs/num_cpus/*/num_cpus/fn.get.html
[`Output`]: https://doc.rust-lang.org/std/process/struct.Output.html
@ -1542,3 +1575,4 @@ fn main() {
[RFC 3339]: https://www.ietf.org/rfc/rfc3339.txt
[twitter hashtag regex]: https://github.com/twitter/twitter-text/blob/c9fc09782efe59af4ee82855768cfaf36273e170/java/src/com/twitter/Regex.java#L255
[uniform distribution]: https://en.wikipedia.org/wiki/Uniform_distribution_(continuous)
[UNIX timestamp]: https://en.wikipedia.org/wiki/Unix_time

2
src/intro.md
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@ -45,6 +45,7 @@ community. It needs and welcomes help. For details see
| [Check number of logical cpu cores][ex-check-cpu-cores] | [![num_cpus-badge]][num_cpus] | [![cat-hardware-support-badge]][cat-hardware-support] |
| [Obtain backtrace of complex error scenarios][ex-error-chain-backtrace] | [![error-chain-badge]][error-chain] | [![cat-rust-patterns-badge]][cat-rust-patterns] |
| [Measure elapsed time][ex-measure-elapsed-time] | [![std-badge]][std] | [![cat-time-badge]][cat-time] |
| [Convert date to UNIX timestamp and vice versa][ex-convert-datetime-timestamp] | [![chrono-badge]][chrono] | [![cat-date-and-time-badge]][cat-date-and-time] |
| [Convert a local time to an another UTC timezone and vice versa][ex-convert-datetime-timezone] | [![chrono-badge]][chrono] | [![cat-date-and-time-badge]][cat-date-and-time] |
| [Display formatted date and time][ex-format-datetime] | [![chrono-badge]][chrono] | [![cat-date-and-time-badge]][cat-date-and-time] |
| [Parse string into DateTime struct][ex-parse-datetime] | [![chrono-badge]][chrono] | [![cat-date-and-time-badge]][cat-date-and-time] |
@ -162,6 +163,7 @@ community. It needs and welcomes help. For details see
[ex-check-broken-links]: net.html#ex-check-broken-links
[ex-check-cpu-cores]: basics.html#ex-check-cpu-cores
[ex-clap-basic]: app.html#ex-clap-basic
[ex-convert-datetime-timestamp]: basics.html#ex-convert-datetime-timestamp
[ex-convert-datetime-timezone]: basics.html#ex-convert-datetime-timezone
[ex-crossbeam-spawn]: concurrency.html#ex-crossbeam-spawn
[ex-csv-delimiter]: encoding.html#ex-csv-delimiter