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Cron expression parser for Amazon EventBridge.

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winebarrel/cronplan

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Overview

Cron expression parser for Amazon EventBridge.

Try with curl

$ curl cronplan.in -d'5 0 10 * ? *'Tue, 10 Oct 2023 00:05:00Fri, 10 Nov 2023 00:05:00Sun, 10 Dec 2023 00:05:00Wed, 10 Jan 2024 00:05:00Sat, 10 Feb 2024 00:05:00Sun, 10 Mar 2024 00:05:00Wed, 10 Apr 2024 00:05:00Fri, 10 May 2024 00:05:00Mon, 10 Jun 2024 00:05:00Wed, 10 Jul 2024 00:05:00

Installation

go get github.com/winebarrel/cronplan

Usage

package mainimport ("fmt""time""github.com/winebarrel/cronplan")funcmain() {cron,err:=cronplan.Parse("0 10 * * ? *")iferr!=nil {panic(err)}fmt.Println(cron.Minute.Exps[0].Number)//=> 0fmt.Println(cron.Hour.Exps[0].Number)//=> 10fmt.Println(cron.String())//=> "0 10 * * ? *"fmt.Println(cron.Match(time.Date(2022,11,3,9,0,0,0,time.UTC)))//=> falsefmt.Println(cron.Match(time.Date(2022,11,3,10,0,0,0,time.UTC)))//=> truefmt.Println(cron.Next(time.Date(2022,11,3,10,0,0,0,time.UTC)))//=> 2022-11-03 10:00:00 +0000 UTCfmt.Println(cron.Next(time.Date(2022,11,3,11,0,0,0,time.UTC)))//=> 2022-11-04 10:00:00 +0000 UTCfmt.Println(cron.NextN(time.Date(2022,11,3,10,0,0,0,time.UTC),3))//=> [2022-11-03 10:00:00 +0000 UTC 2022-11-04 10:00:00 +0000 UTC 2022-11-05 10:00:00 +0000 UTC]fmt.Println(cron.Between(time.Date(2022,11,3,10,0,0,0,time.UTC),time.Date(2022,11,4,10,0,0,0,time.UTC),))//=> [2022-11-03 10:00:00 +0000 UTC 2022-11-04 10:00:00 +0000 UTC]}

Behavior of "L" in day-of-week

If you specify "L" for day-of-week, the last day of the week of each month is usually matched.

# cron(0 0 ? * 6L *)Fri, 27 Oct 2023 00:00:00Fri, 24 Nov 2023 00:00:00Fri, 29 Dec 2023 00:00:00Fri, 26 Jan 2024 00:00:00Fri, 23 Feb 2024 00:00:00

However, if you do not specify the day of the week before "L", the behavior will be the same as when you specify "SAT".

# cron(0 0 ? * L *) = cron(0 0 ? * SAT *)Sat, 07 Oct 2023 00:00:00Sat, 14 Oct 2023 00:00:00Sat, 21 Oct 2023 00:00:00Sat, 28 Oct 2023 00:00:00Sat, 04 Nov 2023 00:00:00

cronplan CLI

CLI to show next triggers.

Installation

brew install winebarrel/cronplan/cronplan

Usage

Usage: cronplan [OPTION] CRON_EXPR  -h int    hour to add  -n int    number of next triggers (default 10)  -version    print version and exit
$ cronplan '*/10 10 ? * MON-FRI *'Tue, 11 Oct 2022 10:00:00Tue, 11 Oct 2022 10:10:00Tue, 11 Oct 2022 10:20:00Tue, 11 Oct 2022 10:30:00Tue, 11 Oct 2022 10:40:00Tue, 11 Oct 2022 10:50:00Wed, 12 Oct 2022 10:00:00Wed, 12 Oct 2022 10:10:00Wed, 12 Oct 2022 10:20:00Wed, 12 Oct 2022 10:30:00$ cronplan -h -9 '*/10 10 ? * MON-FRI *'Tue, 11 Oct 2022 01:00:00Tue, 11 Oct 2022 01:10:00Tue, 11 Oct 2022 01:20:00Tue, 11 Oct 2022 01:30:00Tue, 11 Oct 2022 01:40:00Tue, 11 Oct 2022 01:50:00Wed, 12 Oct 2022 01:00:00Wed, 12 Oct 2022 01:10:00Wed, 12 Oct 2022 01:20:00Wed, 12 Oct 2022 01:30:00

cronmatch CLI

CLI to check if datetime matches cron expression.

Installation

brew install winebarrel/cronplan/cronmatch

Usage

Usage: cronmatch [OPTION] CRON_EXPR DATE  -h int    hour to add  -no-color    disable color output  -version    print version and exit
$ cronmatch -h -9 '0 1 * * ? *' '2022/10/20 10:00''0 1 * * ? *' matches '2022/10/20 10:00' (offset: -9h)$ cronmatch '0 10 * * ? *' 'Oct 10, 2022, 10:10''0 10 * * ? *' does not match 'Oct 10, 2022, 10:10'

cf.https://pkg.go.dev/github.com/araddon/dateparse#readme-extended-example

cronviz CLI

CLI to visualize cron schedule.

inspired bycronv,aws-cronv.

Installation

brew install winebarrel/cronplan/cronviz

Usage

Usage: cronviz [OPTION] [FILE]  -f string    from date (default current date)  -h int    hour to add  -p string    period (default "1d")  -version    print version and exit
$ cat cron.txtbatch1  0 * * * ? *batch2  30 */2 * * ? *batch3  15,45 */3 * * ? *$ cronviz cron.txt > output.html$ open output.html

cf.https://raw.githack.com/winebarrel/cronplan/main/_example/timeline.html

crongrep CLI

CLI to grep with cron expression.

Installation

brew install winebarrel/cronplan/crongrep

Usage

Usage: crongrep [OPTION] CRON_EXPR  -version    print version and exit
$ cronplan -n 5 '10 12 */5 * ? *'Fri, 06 Oct 2023 12:10:00Wed, 11 Oct 2023 12:10:00Mon, 16 Oct 2023 12:10:00Sat, 21 Oct 2023 12:10:00Thu, 26 Oct 2023 12:10:00$ cronplan -n 5 '10 12 */5 * ? *' | crongrep '* * ? * WED-FRI *'Fri, 06 Oct 2023 12:10:00Wed, 11 Oct 2023 12:10:00Thu, 26 Oct 2023 12:10:00

cronskd CLI

CLI to show a schedule of cron expressions.

Installation

brew install winebarrel/cronplan/cronskd

Usage

Usage: cronskd [OPTION] [FILE]  -e string    end date (default: end of day)  -s string    start date (default: beginning of day)  -version    print version and exit
$ cat exprs.txt0 10 * * ? *15 12 * * ? *0 18 ? * MON-FRI *0 8 1 * ? *5 8-10 ? * MON-FRI *$ cronskd -s '2024-11-11' exprs.txtMon, 11 Nov 2024 08:05:00    5 8-10 ? * MON-FRI *Mon, 11 Nov 2024 09:05:00    5 8-10 ? * MON-FRI *Mon, 11 Nov 2024 10:00:00    0 10 * * ? *Mon, 11 Nov 2024 10:05:00    5 8-10 ? * MON-FRI *Mon, 11 Nov 2024 12:15:00    15 12 * * ? *Mon, 11 Nov 2024 18:00:00    0 18 ? * MON-FRI *$ cronskd -s '2024/11/12 10:00' -e 'Nov 13, 2024, 12:00' exprs.txtTue, 12 Nov 2024 10:00:000 10 * * ? *Tue, 12 Nov 2024 10:05:005 8-10 ? * MON-FRI *Tue, 12 Nov 2024 12:15:0015 12 * * ? *Tue, 12 Nov 2024 18:00:000 18 ? * MON-FRI *Wed, 13 Nov 2024 08:05:005 8-10 ? * MON-FRI *Wed, 13 Nov 2024 09:05:005 8-10 ? * MON-FRI *Wed, 13 Nov 2024 10:00:000 10 * * ? *Wed, 13 Nov 2024 10:05:005 8-10 ? * MON-FRI *

cf.https://pkg.go.dev/github.com/araddon/dateparse#readme-extended-example

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