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A DSL for dates.

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package uk.co.unclealex.days

import java.time._

case class DateAndTime(date: Date, time: Time) {
  override def toString: String = {
    f"$date ${time.hours}%02d:${time.minutes}%02d"
  }

  def toLocalDateTime: LocalDateTime = {
    LocalDateTime.of(date.toLocalDate, time.toLocalTime)
  }

  def toZonedDateTime(implicit zoneId: ZoneId): ZonedDateTime = {
    toLocalDateTime.atZone(zoneId)
  }

  def toOffsetDateTime(implicit zoneOffset: ZoneOffset): OffsetDateTime = {
    toLocalDateTime.atOffset(zoneOffset)
  }

  def toInstant(implicit zoneId: ZoneId): Instant = {
    toZonedDateTime.toInstant
  }

}

object DateAndTime {

  def apply(zonedDateTime: ZonedDateTime): DateAndTime = {
    Month.values.find(month => month.month == zonedDateTime.getMonthValue) match {
      case Some(month) => DateAndTime(
        Date(MonthAndDay(zonedDateTime.getDayOfMonth, month), zonedDateTime.getYear),
        Time(zonedDateTime.getHour, zonedDateTime.getMinute))
      case None => throw new IllegalArgumentException(s"Cannot find a month for $zonedDateTime")
    }
  }

  def apply(offsetDateTime: OffsetDateTime): DateAndTime = {
    Month.values.find(month => month.month == offsetDateTime.getMonthValue) match {
      case Some(month) => DateAndTime(
        Date(MonthAndDay(offsetDateTime.getDayOfMonth, month), offsetDateTime.getYear),
        Time(offsetDateTime.getHour, offsetDateTime.getMinute))
      case None => throw new IllegalArgumentException(s"Cannot find a month for $offsetDateTime")
    }
  }
}