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The constraints of java.time values, and of java.util.Date. past, future and their OrPresent forms read the clock of the configuration. The comparisons take a value of the same type.
A null argument checks nothing. A rule that reads a value that may be missing, such as max(customer.limit), never fails because of it: required on that value reports it once.
Event.kt

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Relative to now

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past

past() on LocalDate, LocalDateTime, ZonedDateTime, OffsetDateTime, Instant, YearMonth, Year, Date Checks that the date is before now. past

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future

future() on LocalDate, LocalDateTime, ZonedDateTime, OffsetDateTime, Instant, YearMonth, Year, Date Checks that the date is after now. future

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pastOrPresent

pastOrPresent() on LocalDate, LocalDateTime, ZonedDateTime, OffsetDateTime, Instant, YearMonth, Year, Date Checks that the date is now or before. pastOrPresent

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futureOrPresent

futureOrPresent() on LocalDate, LocalDateTime, ZonedDateTime, OffsetDateTime, Instant, YearMonth, Year, Date Checks that the date is now or after. futureOrPresent

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Comparisons

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after

after(other) on LocalDate, LocalDateTime, LocalTime, OffsetTime, ZonedDateTime, OffsetDateTime, Instant, YearMonth, Year, Date Checks that the date is after other. after

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before

before(other) on LocalDate, LocalDateTime, LocalTime, OffsetTime, ZonedDateTime, OffsetDateTime, Instant, YearMonth, Year, Date Checks that the date is before other. before

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afterOrEqual

afterOrEqual(other) on LocalDate, LocalDateTime, LocalTime, OffsetTime, ZonedDateTime, OffsetDateTime, Instant, YearMonth, Year, Date Checks that the date is other or after. afterOrEqual

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beforeOrEqual

beforeOrEqual(other) on LocalDate, LocalDateTime, LocalTime, OffsetTime, ZonedDateTime, OffsetDateTime, Instant, YearMonth, Year, Date Checks that the date is other or before. beforeOrEqual

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between

between(start, end) on LocalDate, LocalDateTime, LocalTime, OffsetTime, ZonedDateTime, OffsetDateTime, Instant, YearMonth, Year, Date Checks that the date is between start and end, both included. between
between on dates and times is inclusive and uses the message betweenDates. Lengths of time, both kotlin.time.Duration and java.time.Duration, have their rules on Durations.