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utcnow
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tags/v1.0.0
Jonathan Strong 4 years ago
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74aef6852c
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  1. +2
    -0
      .gitignore
  2. +168
    -0
      Cargo.lock
  3. +12
    -0
      Cargo.toml
  4. +21
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      README.md
  5. +80
    -0
      src/main.rs

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.gitignore View File

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/target
*.swp

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Cargo.lock View File

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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
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+ 12
- 0
Cargo.toml View File

@@ -0,0 +1,12 @@
[package]
name = "utcnow"
version = "1.0.0"
authors = ["Jonathan Strong <jonathan.strong@gmail.com>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
chrono = "0.4"
clap = "2"
libc = "0.2.68"

+ 21
- 0
README.md View File

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```
utcnow 1.0.0
Jonathan Strong <jonathan.strong@gmail.com>

current time in utc with non-cryptic interface.

for your own safety and well-being, local time functionality is not provided.

default output format is rfc3339 with trailing 'Z', e.g. '1999-12-31T23:59:59.999999999Z'

USAGE:
utcnow [FLAGS]

FLAGS:
-h, --help help
-r, --rfc2822 display in rfc2822 format
-s, --seconds display unix timestamp in seconds, instead of default nanoseconds
-t, --timespec display as <sec>,<nsec>
-u, --unix display elapsed nanoseconds since 1970-01-01T00:00:00Z
-V, --version version
```

+ 80
- 0
src/main.rs View File

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#![allow(unused)]

use chrono::{DateTime, Utc, NaiveDateTime};

fn nanos(utc: DateTime<Utc>) -> u64 {
(utc.timestamp() as u64) * 1_000_000_000_u64 + (utc.timestamp_subsec_nanos() as u64)
}

fn get_time() -> (i64, i32) {
let mut tv = libc::timespec { tv_sec: 0, tv_nsec: 0 };
unsafe { libc::clock_gettime(libc::CLOCK_REALTIME, &mut tv); }
(tv.tv_sec as i64, tv.tv_nsec as i32)
}

fn timespec_to_utc(sec: i64, nsec: i32) -> DateTime<Utc> {
let naive = NaiveDateTime::from_timestamp(sec, nsec as u32);
DateTime::from_utc(naive, Utc)
}

fn timespec_to_nanos(sec: i64, nsec: i32) -> u64 {
(sec as u64) * 1_000_000_000_u64 + (nsec as u64)
}

fn main() {
let args: clap::ArgMatches = clap::App::new("utcnow")
.author("Jonathan Strong <jonathan.strong@gmail.com>")
.version(clap::crate_version!())
.about("\ncurrent time in utc with non-cryptic interface.\n\n\
for your own safety and well-being, local time functionality is not provided.\n\n\
default output format is rfc3339 with trailing 'Z', e.g. '1999-12-31T23:59:59.999999999Z'")
.help_message("help")
.version_message("version")
.arg(clap::Arg::with_name("unix")
.help("display elapsed nanoseconds since 1970-01-01T00:00:00Z")
.long("unix")
.short("u")
.required(false)
.takes_value(false))
.arg(clap::Arg::with_name("rfc2822")
.help("display in rfc2822 format")
.long("rfc2822")
.short("r")
.required(false)
.takes_value(false))
.arg(clap::Arg::with_name("seconds")
.help("display unix timestamp in seconds, instead of default nanoseconds")
.long("seconds")
.short("s")
.requires("unix")
.required(false)
.takes_value(false))
.arg(clap::Arg::with_name("timespec")
.help("display as <sec>,<nsec>")
.long("timespec")
.short("t")
.required(false)
.takes_value(false))
.get_matches();

let (sec, nsec) = get_time();

if args.is_present("timespec") {
println!("{},{}", sec, nsec);
} else if args.is_present("unix") {
if args.is_present("seconds") {
println!("{}", sec);
} else {
println!("{}", timespec_to_nanos(sec, nsec));
}
} else if args.is_present("rfc2822") {

println!("{}", timespec_to_utc(sec, nsec).to_rfc2822());

} else {
// Debug view is iso format / rfc3339 that we want
// Display has spaces - no go
// to_rfc3339 uses +00:00 instead of Z, which I don't like
println!("{:?}", timespec_to_utc(sec, nsec));
}
}

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