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@cheap-glitch/mi-cron
Advanced tools
Readme
const { parseCron } = require('@cheap-glitch/mi-cron');
console.log(parseCron.nextDate('*/5 6-12 3 3 *').toUTCString());
// Wed, 03 Mar 2021 06:00:00
This is a microscopic (~1KB minified & gzipped) zero-dependencies parser for
standard cron expressions.
It also supports a few non-standard but convenient features, such as
@-shorthands (e.g. @daily
) and steps (e.g. */10
), and can compute the next
scheduled date for a given expression.
npm i @cheap-glitch/mi-cron
Parses a standard cron expression. Supports:
*
)0-30
, mon-fri
)*/3
, 20-31/2
, 10/5
)1,15
, 0-10,20-30/2
)@weekly
)Does NOT support:
L
, W
, #
, ?
, H
@reboot
Returns an object with all possible values for each field (minutes, hours, days,
months and days of the week), or undefined
if the expression is invalid (wrong
syntax, unsupported instruction, impossible range, etc).
const { parseCron } = require('@cheap-glitch/mi-cron');
console.log(parseCron('*/5 6-10 1,15 * wed'));
// {
// minutes: [0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55],
// hours: [6, 7, 8, 9, 10],
// days: [1, 15],
// months: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12],
// weekDays: [3],
// }
Takes a cron schedule or expression and returns the next date that matches the
schedule, or undefined
if the expression is invalid. If given a datetime as
the second argument, it will start the computation from this time (otherwise it
will use the current datetime at the moment it's called).
const { parseCron } = require('@cheap-glitch/mi-cron');
console.log(parseCron.nextDate('* * * * *', new Date('01 Jan 2020 00:00:00 GMT')).toUTCString());
// Wed, 01 Jan 2020 00:01:00
// Get the next five scheduled dates
const schedule = parseCron('@weekly');
const nextDate = new Date();
for (let i=0; i<5; i++) {
console.log(nextDate = parseCron.nextDate(schedule, nextDate));
}
Copyright (c) 2020-present, cheap glitch
Permission to use, copy, modify, and/or distribute this software for any purpose
with or without fee is hereby granted, provided that the above copyright notice
and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
THIS SOFTWARE.
FAQs
A microscopic parser for standard cron expressions.
The npm package @cheap-glitch/mi-cron receives a total of 6,775 weekly downloads. As such, @cheap-glitch/mi-cron popularity was classified as popular.
We found that @cheap-glitch/mi-cron demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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