Cron library enables parsing and building complex Cron expressions with intuitive builder functions, supports custom first week days, validates parsing rules, and handles various DateTime libraries.
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Cron realization for Kotlin Multiplatform
builder
.seconds(10 at 0) //Every 10 seconds starting at 0 seconds
.minutes(5..25) // Every minute between 5 and 25
.hours(5, 12) // Specific hours: 5 and 12
.daysOfWeek(7 on 5) // On the 5th Sunday of the month
.years(2050) // Specific year: 2050
cron {
seconds(10 at 0)//Every 10 seconds starting at 0 seconds
minutes(5..25) // Every minute between 5 and 25
hours(5, 12) // Specific hours: 5 and 12
daysOfWeek(7 on 5) // On the 5th Sunday of the month
years(2050) // Specific year: 2050
}
val builder = Builder(WeekDays.Sunday)
builder
.daysOfWeek(7 on 5) // On the 5th Saturday of the month
Add with Gradle
kotlin {
sourceSets {
commonMain {
dependencies {
implementation 'com.ucasoft.kcron:kcron-common:0.33.9'
}
}
}
}
Build Cron expression
val builder = Cron.builder()
// By default, builder contains any expression for every part
println(builder.expression) // * * * ? * * *
builder
.seconds(10 at 0)
.minutes(5..25)
.hours(5, 12)
.daysOfWeek(7 on 5)
.years(2050)
println(builder.expression) // 0/10 5-25 5,12 ? * 7#5 2050
Parse as Classic as well as Modern Cron expressions
// Auto detect
val builder = Cron.parseAndBuild("0/10 5-25 5,12 ? * 7#5 2050") {
it.firstDayOfWeek = WeekDays.Sunday
}
@OptIn(DelicateIterableApi::class)
println(builder.asIterable().take(10))
/* Result:
[
2050-01-29T05:05,
2050-01-29T05:05:10,
2050-01-29T05:05:20,
2050-01-29T05:05:30,
2050-01-29T05:05:40,
2050-01-29T05:05:50,
2050-01-29T05:06,
2050-01-29T05:06:10,
2050-01-29T05:06:20,
2050-01-29T05:06:30
]
*/
// OR Force to parse only Classic expressions
try {
val builder = Cron.parseAndBuild() {
it.version = Version.Classic
}
} (e: WrongCronExpression) {
println(e.message)
}
Days of week and months can be defined in a parsed expression as numbers as well as short names
builder = Cron.parseAndBuild("15/10 5-25 5 ? JAN,MAR 2,3,4,5 2050")
println(builder.nextRun) // 2050-01-04T05:05:15
// OR
builder = Cron.parseAndBuild("15/10 5-25 5 ? 2-4 MON 2050")
println(builder.nextRun) // 2050-02-07T05:05:15
Easy change any part of expression
val builder = Cron.parseAndBuild("0/10 5-25 5,12 ? * SUN#5 2050")
builder.years(2021..2025)
println(builder.expression) // 0/10 5-25 5,12 ? * SUN#5 2021-2025
This library is on beta version 0.33.9.
It is continuing to develop.
Check the news!