A cron expression parser. Works with stable Rust v1.28.0.
The project is based on zslayton/cron, thank him very much.
In addition to the regular expressions, you can also use the following shortcut expressions with Schedule::from_str, such as @yearly @monthly @weekly @daily @hourly @minutely @secondly, make cron- Expression Iterator.
If you need a periodicized task manager, you may need delay-timer (Time-manager of delayed tasks. Like crontab, but synchronous asynchronous tasks are possible, and dynamic add/cancel/remove is supported) .
use cron::Schedule;
use chrono::Utc;
use std::str::FromStr;
fn main() {
// sec min hour day of month month day of week year
let expression = "0 30 9,12,15 1,15 May-Aug Mon,Wed,Fri 2018/2";
let schedule = Schedule::from_str(expression).unwrap();
println!("Upcoming fire times:");
for datetime in schedule.upcoming(Utc).take(10) {
println!("-> {}", datetime);
}
}
/*
Upcoming fire times:
-> 2018-06-01 09:30:00 UTC
-> 2018-06-01 12:30:00 UTC
-> 2018-06-01 15:30:00 UTC
-> 2018-06-15 09:30:00 UTC
-> 2018-06-15 12:30:00 UTC
-> 2018-06-15 15:30:00 UTC
-> 2018-08-01 09:30:00 UTC
-> 2018-08-01 12:30:00 UTC
-> 2018-08-01 15:30:00 UTC
-> 2018-08-15 09:30:00 UTC
*/ extern crate chrono;
extern crate cron_clock;
use cron_clock::Schedule;
use chrono::Utc;
use std::str::FromStr;
fn main() {
// shortcut expressions
let expression = "@hourly";
let schedule = Schedule::from_str(expression).unwrap();
println!("Upcoming fire times:");
// `upcoming_owned` Get iterators with ownership, so you don't have lifetime to worry about.
for datetime in schedule.upcoming_owned(Utc).take(10) {
println!("-> {}", datetime);
}
}Licensed under either of
- Apache License, Version 2.0 (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT) at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you shall be dual licensed as above, without any additional terms or conditions.