java8 Date与LocalDataTiem工具类

import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;

/**
 * 时间、日期转换工具类
 */
public class TimeTransferUtil {
    // 默认时区
    protected static final ZoneId zone = ZoneId.systemDefault();

    /**
     * 日期 to LocalDate
     */
    public static LocalDate dateToLocalDate(Date date) {
        return date.toInstant().atZone(zone).toLocalDate();
    }

    /**
     * LocalDate to 日期
     */
    public static Date localDateToDate(LocalDate localDate) {
        Instant instant = localDate.atStartOfDay().atZone(zone).toInstant();
        return Date.from(instant);
    }

    /**
     * 日期 to LocalDateTime
     */
    public static LocalDateTime dateToLocalDateTime(Date date) {
        return date.toInstant().atZone(zone).toLocalDateTime();
    }

    /**
     * LocalDateTime to 日期
     */
    public static Date localDateTimeToDate(LocalDateTime dateTime) {
        Instant instant = dateTime.atZone(zone).toInstant();
        return Date.from(instant);
    }

    /**
     * 时间戳 to LocalDateTime
     */
    public static LocalDateTime millisToLocalDataTime(long millis) {
        return Instant.ofEpochMilli(millis).atZone(zone).toLocalDateTime();
    }

    /**
     * LocalDateTime to 时间戳
     */
    public static long localDateTimeToMillis(LocalDateTime dateTime) {
        return dateTime.atZone(zone).toInstant().toEpochMilli();
    }

    /**
     * 相差天数
     */
    public static long getOffsetDays(LocalDate from, LocalDate to) {
        return to.toEpochDay() - from.toEpochDay();
    }

    /**
     * 相差月数
     *
     * 或者使用
     * from.until(to, ChronoUnit.DAYS))
     * from.until(to, ChronoUnit.WEEKS)
     * from.until(to, ChronoUnit.MONTHS)
     */
    public static long getOffsetMonths(LocalDate from, LocalDate to) {
        return (to.getYear() - from.getYear()) * 12L + (to.getMonthValue() - from.getMonthValue());
    }
}

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