日期工具类 DateTools

public class DateTools {

    /** The DAT e_ forma t1. */
    public static String DATE_FORMAT1 = "yyyy-MM-dd HH:mm:ss";

/**
     * 获取两个时间段的交集
     * @param s1
     * @param e1
     * @param s2
     * @param e2
     * @return
     */
    public static Map<String, LocalDateTime> getOverlapDuration(LocalDateTime s1,LocalDateTime e1,LocalDateTime s2,LocalDateTime e2){
        Map<String, LocalDateTime> localDateTimeMap = new HashMap<>();
        //是否有交集
        long s1InMillis = Timestamp.valueOf(s1).getTime();
        long e1InMillis = Timestamp.valueOf(e1).getTime();
        long s2InMillis = Timestamp.valueOf(s2).getTime();
        long e2InMillis = Timestamp.valueOf(e2).getTime();

        long overlapStartTime = 0;
        long overlapEndTime = 0;
        if((s1InMillis>=s2InMillis&&s1InMillis<=e2InMillis)
                ||(e1InMillis>=s2InMillis&&e1InMillis<=e2InMillis)){
            overlapStartTime = s1InMillis>=s2InMillis?s1InMillis:s2InMillis;
            overlapEndTime = e1InMillis<=e2InMillis?e1InMillis:e2InMillis;
        }
        LocalDateTime start = LocalDateTime.ofInstant(Instant.ofEpochMilli(overlapStartTime), ZoneId.systemDefault());
        LocalDateTime end = LocalDateTime.ofInstant(Instant.ofEpochMilli(overlapEndTime), ZoneId.systemDefault());
        localDateTimeMap.put("start", start);
        localDateTimeMap.put("end" , end);
        return localDateTimeMap;
    }

}