cron parser

Library for parsing cron syntax, returning the next available date.

Example:

use chrono::{TimeZone, Utc};
use cron_parser::parse;

fn main() {
   if let Ok(next) = parse("*/5 * * * *", Utc::now()) {
        println!("when: {}", next);
   }

   // passing a custom timestamp
   if let Ok(next) = parse("0 0 29 2 *", Utc.timestamp(1893456000, 0)) {
        println!("next leap year: {}", next);
        assert_eq!(next.timestamp(), 1961625600);
   }
}

Cron table:

# ┌─────────────────────  minute (0 - 59)
# │ ┌───────────────────  hour   (0 - 23)
# │ │ ┌─────────────────  dom    (1 - 31) day of month
# │ │ │ ┌───────────────  month  (1 - 12)
# │ │ │ │ ┌─────────────  dow    (0 - 6 or Sun - Sat)  day of week (Sunday to Saturday)
# │ │ │ │ │
# │ │ │ │ │
# │ │ │ │ │
# * * * * * command to execute

Field	Required	Allowed values	Allowed special characters
Minutes	Yes	0–59	* , - /
Hours	Yes	0–23	* , - /
Day of month	Yes	1–31	* , - /
Month	Yes	1–12	* , - /
Day of week	Yes	0–6 or Sun-Sat	* , - /

For the day of the week, when using a Weekday (Sun-Sat) the expression */Day is not supported instead use the integer, reasons for this is that for example */Wed = */3 translates to run every 3rd day of week, this means Sunday, Wednesday, Saturday.

* any value
, value list separator
- range of values
/ step values

cron-parser 0.3.0

cron parser