DataUtils 时间工具类

public class DataUtils {

    /**
     *
     * @description: 获得当天最小时间
     * @author: Jeff
     * @date: 2019年12月21日
     * @param date
     * @return
     */
    public static Date getStartOfDay(Date date) {
        LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()),
                ZoneId.systemDefault());
        LocalDateTime startOfDay = localDateTime.with(LocalTime.MIN);
        return Date.from(startOfDay.atZone(ZoneId.systemDefault()).toInstant());
    }

    /**
     *
     * @description: 获得当天最大时间
     * @author: Jeff
     * @date: 2019年12月21日
     * @param date
     * @return
     */
    public static Date getEndOfDay(Date date) {
        LocalDateTime localDateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(date.getTime()),
                ZoneId.systemDefault());
        LocalDateTime endOfDay = localDateTime.with(LocalTime.MAX);
        return Date.from(endOfDay.atZone(ZoneId.systemDefault()).toInstant());
    }

    /*
     * 获取当前时间多少小时前的时差
     * */
    public static Date getSubHours(Calendar c, int amount) {
        Date courrentTime = c.getTime();
        c.setTime(new Date());
        c.add(Calendar.HOUR, -amount);
        return c.getTime();
    }

    /*
     * 获取当前时间多少天
     * */
    public static Date getSubDay(Calendar c, int amount) {
        Date courrentTime = c.getTime();
        c.setTime(new Date());
        c.add(Calendar.DATE, -amount);
        return c.getTime();
    }

/**
 * 获取当时时间N月前的时间
 * @param time
 * @param month
 * @return
 */
public static Date getBeforeMonthTime(Date time,int month) {
    Calendar c = Calendar.getInstance();
    c.setTime(new Date());
    c.add(Calendar.MONTH, -month);
    Date date = c.getTime();
    return date;
}
/**
 * 获取当时时间N月后的时间
 * @param time
 * @param month
 * @return
 */
public static Date getAfterMonthTime(Date time,int month) {
    Calendar c = Calendar.getInstance();
    c.setTime(new Date());
    c.add(Calendar.MONTH, month);
    Date date = c.getTime();
    return date;
}

}