Java（九）：LocalDate和LocalDateTime时间处理

LocalDateTime now = LocalDateTime.now();
System.out.println("当前时间：" + now);
System.out.println("格式化：" + now.format(DateTimeFormatter.ofPattern("YYYY-MM-dd hh:mm:ss")));
LocalDateTime firstDay = now.withDayOfMonth(1);
System.out.println("本月第一天：" + firstDay);
LocalDateTime lastSecondOfDay = now.withHour(23).withMinute(59).withSecond(59);
System.out.println("当天最后一秒：" + lastSecondOfDay);
LocalDateTime lastDay = now.with(TemporalAdjusters.lastDayOfMonth());
System.out.println("本月最后一天:" + lastDay);
// 获取秒数时间戳（10位）
LocalDateTime.now().toInstant(ZoneOffset.of("+8"));
// 获取毫秒数时间戳（13位）
LocalDateTime.now().toInstant(ZoneOffset.of("+8")).toEpochMilli();
// 求时间差
LocalDateTime now = LocalDateTime.now();
System.out.println("计算两个时间的差：");
LocalDateTime end = LocalDateTime.now();
Duration duration = Duration.between(now, end);
long days = duration.toDays(); //相差的天数
long hours = duration.toHours();//相差的小时数
long minutes = duration.toMinutes();//相差的分钟数
long millis = duration.toMillis();//相差毫秒数
long nanos = duration.toNanos();//相差的纳秒数
System.out.println(now);
System.out.println(end);
System.out.println("耗时【 " + days + "天：" + hours + " 小时：" + minutes + " 分钟：" + millis + " 毫秒：" + nanos + " 纳秒】");