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ktime
Kotlin extensions to the java8 time library
Examples
Conversion from numbers to Duration
Int, Long and Double values can be suffixed with a time unit to create a Duration
val delay = 30.seconds // equal to Duration.ofSeconds(30)
val longDelay = 2.5.minutes // equal to Duration.ofSeconds(150)
Available Duration suffixes: nanos, micros, millis, seconds, minutes, hours
Conversion from numbers to Period
Int and Long values can be suffixed with a date unit to create a Period
val interval = 30L.days
Available Period suffixes: days, weeks, months, years
Mathematical operations on Duration and Period
addition, subtraction, negation
val duration = 2.hours + 30.minutes
val period = 2.months + 14.days
val duration = 1.hours - 1.minutes
val negativeDuration = -30.seconds
Scaling
val fullDuration = 2.5.hours
val doubledDuration = 2.5.hours * 2
val halfDuration = 2.5.hours / 2
Comparisons on Duration
Note that Period is not Comparable
1.hours > 1.minutes
1000.nanos == 1.micros
Destructuring
val (sec, nano) = 2.5.seconds
val (y, m, d) = 1.years + 2.months + 3.days
Offsets from now
These produce an OffsetDateTime with a UTC offset:
val lastHour = 1.hours.ago
val thisTimeTomorrow = 1.days.fromNow
Operations on times and dates
Add or subtract Duration or Period from date/time types
val startTime = 30.seconds.fromNow
val stopTime = startTime + 1.minutes // add Durations & Periods to dates & times
TemporalQueries
Most TemporalQueries involve extracting a data type that contains a subset of the data for the current data type. For example, you can go from OffsetDateTime to LocalDateTime, but not vice-versa because LocalDateTime doesn't have zoneOffset.
val thisYear: Year = 0.seconds.ago.year
val thisMonth: Month = 0.seconds.ago.month
val dayOfWeek: DayOfWeek = 0.seconds.ago.dayOfWeek
val currentTime: localTime = 0.seconds.ago.localTime
TemporalAdjusters
val startOfThisMonth = 0.seconds.ago.atStartOfThisMonth
val startOfNextMonth = 0.seconds.ago.atStartOfNextMonth
val endOfThisMonth = 0.seconds.ago.atEndOfThisMonth
val startOfThisYear = 0.seconds.ago.atStartOfThisYear
val startOfNextYear = 0.seconds.ago.atStartOfNextYear
val endOfThisYear = 0.seconds.ago.atEndOfThisYear
Temporal Ranges
Although java 8's time library doesn't support the idea of a Range, this library does. In addition to offering a step modifier, these
ranges also offer a unit modifier. The unit modifier is used to specify the unit (MINUTES, DAYS, etc.) to use if you iterate over
the range. If no unit is specified, the native precision is used (e.g. the native precision for a date is DAYS, the native precision for
DateTimes is NANOS)
Inclusive ranges
(2010.asYear..2020.asYear).count() // should be equal to 11
val inOfferPeriod = 0.seconds.ago in offer.start..offer.end
for (d in date1..date2) {...}
for (d in time1..time2 step 10 unit MINUTES) {...}
for (d in dateTime1..dateTime2 unit DAYS) {...}
Exclusive ranges
(2010.asYear until 2020.asYear).count() // should be equal to 10
for (d in date1 until date2) {...}
for (d in time1 until time2 step 10 unit MINUTES) {...}
for (d in dateTime1 until dateTime2 unit DAYS) {...}