ChronoUnit

一组标准的日期时间单位。

这组单元提供基于单元的访问来操纵日期，时间或日期时间。 可以通过实现TemporalUnit来扩展标准单元集。

这些单元适用于多个日历系统。

例如，大多数非ISO日历系统定义年，月和日的单位，只是略有不同的规则。 每个单元的文档说明了它的运作方式。

这是一个最终的、不可变的和线程安全的枚举。

入门例子

plus() 测试

@Test
public void testChromoUnitsPlus() {
    //Get the current date
    LocalDate today = LocalDate.now();
    System.out.println("Current date: " + today);
    //add 1 week to the current date
    LocalDate nextWeek = today.plus(1, ChronoUnit.WEEKS);
    System.out.println("Next week: " + nextWeek);
    //add 1 month to the current date
    LocalDate nextMonth = today.plus(1, ChronoUnit.MONTHS);
    System.out.println("Next month: " + nextMonth);
    //add 1 year to the current date
    LocalDate nextYear = today.plus(1, ChronoUnit.YEARS);
    System.out.println("Next year: " + nextYear);
    //add 10 years to the current date
    LocalDate nextDecade = today.plus(1, ChronoUnit.DECADES);
    System.out.println("Date after ten year: " + nextDecade);
}

日志信息

Current date: 2019-02-27
Next week: 2019-03-06
Next month: 2019-03-27
Next year: 2020-02-27
Date after ten year: 2029-02-27

between

@Test
public void testChromoUnitsBetween() {
    //Get the current date
    LocalDate today = LocalDate.now();
    LocalDate nextWeek = today.plus(1, ChronoUnit.WEEKS);
    long diff = ChronoUnit.WEEKS.between(today, nextWeek);
    Assert.assertEquals(1, diff);
}