cronos-cron

A cron expression parser that's safe to use in the Solana runtime. Works with stable Rust v1.28.0.

```rust use cronos_cron::Schedule; use chrono::{DateTime, NaiveDateTime, 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::fromstr(expression).unwrap(); let ts = 1234567890; let nextexecat = schedule .after(&DateTime::::fromutc( NaiveDateTime::from_timestamp(ts, 0), Utc, )) .take(1) .next() { Some(datetime) => Some(datetime.timestamp()), None => None, } }

/* 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 */ ```