自己学习中的知识点（2）---jdk8 时间新特性

自己学到的知识点，相当于笔记，若有问题，欢迎指出

获取当前时间及当前的年，月，日

LocalDate today= LocalDate.now();

int year = today.getYear();

int month = today.getMonthValue();

int day = today.getDayOfMonth();

获取某个特定时间

LocalDate ofEpochDay = LocalDate.of(2017, 01, 02);

获取某一时间所在周周一（也可获取一周内的任一天，1是代表周一，依次类推）

LocalDate days = 时间；

TemporalField fieldISO1 = WeekFields.of(Locale.FRANCE).dayOfWeek();

LocalDate monday = days.with(fieldISO1, 1);

将java.util.Date类型转换为LocalDate类型

Date times = new Date();

Instant instant = times.toInstant();

ZoneId zone = ZoneId.systemDefault();

LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone);

LocalDate localDate = localDateTime.toLocalDate();

将LocalDate类型转换为java.util.Date类型

LocalDate localDate= LocalDate.now();

ZoneId zone = ZoneId.systemDefault();

Instant instant = localDate.atStartOfDay().atZone(zone).toInstant();

Date date = Date.from(instant);

两个日期之间相隔多久

LocalDate localDate= LocalDate.now();

LocalDate ofEpochDay = LocalDate.of(2017, 01, 02);

// 相隔天

int days = (int)ChronoUnit.DAYS.between(ofEpochDay, localDate);

// 相隔月

int months = (int)ChronoUnit.MONTHS.between(ofEpochDay, localDate);

//相隔年

int months = (int)ChronoUnit.YEARS.between(ofEpochDay, localDate);

获取多久后的日期

LocalDate today= LocalDate.now();

// 一周后的

LocalDate nextWeek = today.plus(1, ChronoUnit.WEEKS);

//一年后的

LocalDate nextYear = today.plus(1, YEARS);

//一年前的

LocalDate previousYear = today.minus(1, ChronoUnit.YEARS);