Java1.8时间API

LocalDate、LocalTime、LocalDateTime

LocalDate

// 获取当前日期
LocalDate now = LocalDate.now();
// 设置日期
LocalDate localDate = LocalDate.of(2019, 9, 10);
// 获取年
int year = localDate.getYear();     //结果：2019
int year1 = localDate.get(ChronoField.YEAR); //结果：2019
// 获取月
Month month = localDate.getMonth();   // 结果：SEPTEMBER
int month1 = localDate.get(ChronoField.MONTH_OF_YEAR); //结果：9
// 获取日
int day = localDate.getDayOfMonth();   //结果：10
int day1 = localDate.get(ChronoField.DAY_OF_MONTH); // 结果：10
// 获取星期
DayOfWeek dayOfWeek = localDate.getDayOfWeek();   //结果：TUESDAY
int dayOfWeek1 = localDate.get(ChronoField.DAY_OF_WEEK); //结果：2

LocalTime

// 获取当前时间
LocalTime now = LocalTime.now();
// 设置时间
LocalTime localTime = LocalTime.of(13, 51, 10);
//获取小时
int hour = localTime.getHour();    // 结果：13
int hour1 = localTime.get(ChronoField.HOUR_OF_DAY); // 结果：13
//获取分
int minute = localTime.getMinute();  // 结果：51
int minute1 = localTime.get(ChronoField.MINUTE_OF_HOUR); // 结果：51
//获取秒
int second = localTime.getSecond();   // 结果：10
int second1 = localTime.get(ChronoField.SECOND_OF_MINUTE); // 结果：10

LocalDateTime

// 获取当前日期时间
LocalDateTime localDateTime = LocalDateTime.now();
// 设置日期
LocalDateTime localDateTime1 = LocalDateTime.of(2019, Month.SEPTEMBER, 10, 14, 46, 56);
LocalDateTime localDateTime2 = LocalDateTime.of(localDate, localTime);
LocalDateTime localDateTime3 = localDate.atTime(localTime);
LocalDateTime localDateTime4 = localTime.atDate(localDate);
// 获取LocalDate
LocalDate localDate2 = localDateTime.toLocalDate();
// 获取LocalTime
LocalTime localTime2 = localDateTime.toLocalTime();

Instant

// 创建Instant对象
Instant instant = Instant.now();
// 获取秒
long currentSecond = instant.getEpochSecond();
// 获取毫秒
long currentMilli = instant.toEpochMilli();

DateTimeFormatter

格式化时间

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd hh:mm:ss");
//格式化
String str = formatter.format(LocalDateTime.now());
//解析
TemporalAccessor accessor = formatter3.parse("2021-05-18 06:42:08");