eta_index_lib/models/edb_data_residual_analysis.go

package models

import (
	"encoding/json"
	"eta/eta_index_lib/utils"
	"fmt"
	"github.com/beego/beego/v2/client/orm"
	"math"
	"sort"
	"strconv"
	"time"
)

type edbDataResidualAnalysis struct {
	EdbDataId     int       `orm:"column(edb_data_id);pk;auto" description:"自增id"`
	EdbInfoId     int       `orm:"column(edb_info_id)" description:"指标id"`
	EdbCode       string    `orm:"column(edb_code)" description:"指标编码"`
	DataTime      string    `orm:"column(data_time)" description:"数据日期"`
	Value         float64   `orm:"column(value)" description:"数据值"`
	CreateTime    time.Time `orm:"column(create_time)" description:"创建时间"`
	ModifyTime    time.Time `orm:"column(modify_time)" description:"修改时间"`
	DataTimeStamp int64     `orm:"column(data_timestamp)"`
}

func init() {
	orm.RegisterModel(new(edbDataResidualAnalysis))
}

// AddResidualAnalysisData 新增指标数据
func AddResidualAnalysisData(dataList []edbDataResidualAnalysis) (num int64, err error) {
	o := orm.NewOrmUsingDB("data")
	num, err = o.InsertMulti(len(dataList), dataList)
	if err != nil {
		return 0, err
	}

	return num, nil
}

// RefreshAllCalculateResidualAnalysis 刷新残差分析
func RefreshAllCalculateResidualAnalysis(edbInfoId, source, subSource, formulaInt, moveType int, fromEdbInfo *EdbInfo, edbCode, startDate, endDate, moveFrequency string) (err error) {
	o := orm.NewOrm()
	to, err := o.Begin()
	if err != nil {
		return
	}
	defer func() {
		if err != nil {
			fmt.Println("RefreshAllCalculateResidualAnalysis,Err:" + err.Error())
			_ = to.Rollback()
		} else {
			_ = to.Commit()
		}
	}()
	configMapping, err := GetConfigMappingListByConditionNotBase(edbInfoId)
	if err != nil {
		return err
	}

	var edbInfoIdList []int64
	for _, v := range configMapping {
		edbInfoIdList = append(edbInfoIdList, v.EdbInfoId)
	}

	//清空原有数据
	sql := ` DELETE FROM edb_data_residual_analysis WHERE edb_info_id in (` + utils.GetOrmInReplace(len(edbInfoIdList)) + `) `
	_, err = to.Raw(sql, edbInfoIdList).Exec()
	if err != nil {
		return
	}

	//计算数据
	err = refreshAllCalculateResidualAnalysis(to, edbInfoId, source, subSource, formulaInt, moveType, fromEdbInfo, edbCode, startDate, endDate, moveFrequency, configMapping)

	return
}

// refreshAllCalculateResidualAnalysis 刷新所有残差分析
func refreshAllCalculateResidualAnalysis(to orm.TxOrmer, edbInfoId, source, subSource, formulaInt, moveType int, fromEdbInfo *EdbInfo, edbCode, startDate, endDate, moveFrequency string, configMapping []CalculateResidualAnalysisConfigMapping) (err error) {
	fmt.Println("refreshAllCalculateResidualAnalysis startDate:", startDate)

	calculateMappingList, err := GetCalculateMappingListByEdbInfoId(edbInfoId)
	if err != nil {
		return err
	}
	edbInfoIdA := calculateMappingList[0].FromEdbInfoId
	edbInfoIdB := calculateMappingList[1].FromEdbInfoId

	mappingList, err := GetEdbInfoListByIds([]int{edbInfoIdA, edbInfoIdB})
	if err != nil {
		return err
	}

	var edbInfoMappingA, edbInfoMappingB *EdbInfoList
	for _, v := range mappingList {
		if v.Unit == "无" {
			v.Unit = ""
		}
		if v.EdbInfoId == edbInfoIdA {
			edbInfoMappingA = v
		}
		if v.EdbInfoId == edbInfoIdB {
			edbInfoMappingB = v
		}
	}
	if edbInfoMappingA == nil {
		return fmt.Errorf("指标A不存在")
	}
	if edbInfoMappingB == nil {
		return fmt.Errorf("指标B不存在")
	}

	// 从配置中取出时间范围
	analysisConfig, err := GetResidualAnalysisConfigById(edbInfoId)
	if err != nil {
		return err
	}
	configString := analysisConfig.Config

	var config ResidualAnalysisConfig
	err = json.Unmarshal([]byte(configString), &config)

	// 时间处理
	switch config.DateType {
	case 0:
		startDate = config.StartDate
		endDate = config.EndDate
	case 1:
		startDate = config.StartDate
		endDate = ""
	default:
		startDate = utils.GetPreYearTime(config.DateType)
		endDate = ""
	}

	// 原始图表信息
	originalEdbList := make([]EdbInfoList, 0)

	originalEdbList, fullADataList, fullBDataList, err := fillOriginalChart(config, fromEdbInfo, mappingList, startDate, endDate, edbInfoMappingA, edbInfoMappingB, originalEdbList)
	if err != nil {
		return err
	}

	indexADataMap := map[string]*EdbData{}
	for _, indexData := range edbInfoMappingA.DataList {
		indexADataMap[indexData.DataTime] = indexData
	}

	// 映射图表信息
	mappingEdbList, _, _, _, err := fillMappingChartInfo(config, fromEdbInfo, edbInfoMappingA, edbInfoMappingB, originalEdbList, indexADataMap, startDate, endDate, fullADataList, fullBDataList)
	if err != nil {
		return err
	}

	// 残差图表信息
	residualEdbList, _, err := fillResidualChartInfo(config, fromEdbInfo, edbInfoMappingA, edbInfoMappingB, mappingEdbList)

	// 映射指标 与 残差指标 同步刷新
	for _, mapping := range configMapping {
		var edbDataResidualAnalysisList []edbDataResidualAnalysis
		if mapping.IndexType == 1 {
			for _, edbData := range mappingEdbList[1].DataList {
				value, _ := strconv.ParseFloat(edbData.Value, 64)
				edbDataResidualAnalysisList = append(edbDataResidualAnalysisList, edbDataResidualAnalysis{
					EdbInfoId:     int(mapping.EdbInfoId),
					EdbCode:       edbData.EdbCode,
					DataTime:      edbData.DataTime,
					Value:         value,
					CreateTime:    time.Now(),
					ModifyTime:    time.Now(),
					DataTimeStamp: edbData.DataTimestamp,
				})
			}

			_, err = AddResidualAnalysisData(edbDataResidualAnalysisList)
			if err != nil {
				return err
			}
		} else if mapping.IndexType == 2 {
			for _, edbData := range residualEdbList[1].DataList {
				value, _ := strconv.ParseFloat(edbData.Value, 64)
				edbDataResidualAnalysisList = append(edbDataResidualAnalysisList, edbDataResidualAnalysis{
					EdbInfoId:     int(mapping.EdbInfoId),
					EdbCode:       edbData.EdbCode,
					DataTime:      edbData.DataTime,
					Value:         value,
					CreateTime:    time.Now(),
					ModifyTime:    time.Now(),
					DataTimeStamp: edbData.DataTimestamp,
				})
			}

			_, err = AddResidualAnalysisData(edbDataResidualAnalysisList)
			if err != nil {
				return err
			}
		}
	}

	return
}

func fillResidualChartInfo(config ResidualAnalysisConfig, req *EdbInfo, edbInfoMappingA *EdbInfoList, edbInfoMappingB *EdbInfoList, mappingEdbList []EdbInfoList) ([]EdbInfoList, float64, error) {
	// 计算公式 映射残差 = 因变量指标 - 映射指标
	var edbInfoA, edbInfoB EdbInfoList
	if mappingEdbList[0].EdbInfoId == edbInfoMappingA.EdbInfoId {
		edbInfoA = mappingEdbList[0]
		edbInfoB = mappingEdbList[1]
	} else {
		edbInfoA = mappingEdbList[1]
		edbInfoB = mappingEdbList[0]
	}
	dataAList := edbInfoA.DataList
	edbData := make([]*EdbDataList, len(dataAList))
	for i, data := range dataAList {
		f, _ := strconv.ParseFloat(data.Value, 64)
		edbData[i] = &EdbDataList{
			Value:         f,
			DataTimestamp: data.DataTimestamp,
			DataTime:      data.DataTime,
			EdbInfoId:     data.EdbInfoId,
			EdbDataId:     data.EdbDataId,
		}
	}

	dataBList := edbInfoB.DataList

	// 映射指标开始时间
	var startTime string
	if len(dataBList) > 0 {
		startTime = dataBList[0].DataTime
	}

	var indexDataBMap = make(map[string]*EdbData)
	for _, data := range dataBList {
		indexDataBMap[data.DataTime] = data
	}
	// 求R2
	var valueB, sumValueA, averageValueA, residualQuadraticSum, totalQuadraticSum, R2 float64

	for _, indexData := range edbData {
		// 因变量的值总和
		sumValueA += indexData.Value
	}
	// 因变量平均值
	averageValueA = sumValueA / float64(len(edbData))

	var indexMax, indexMin float64

	var edbDataResp []*EdbDataList
	if len(edbData) > 0 {
		indexMax = edbData[0].Value
		indexMin = edbData[0].Value
		for _, indexData := range edbData {
			if dataB, ok := indexDataBMap[indexData.DataTime]; ok {
				f, _ := strconv.ParseFloat(dataB.Value, 64)
				valueB = f
			} else {
				continue
			}

			// 总因变量平方和
			totalQuadraticSum += math.Pow(indexData.Value-averageValueA, 2)

			// 补全残差值

			indexData.Value = math.Round((indexData.Value-valueB)*10000) / 10000

			// 残差平方和
			residualQuadraticSum += math.Pow(indexData.Value, 2)

			if indexData.Value > indexMax {
				indexMax = indexData.Value
			}
			if indexData.Value < indexMin {
				indexMin = indexData.Value
			}

			// 获取映射指标之后的数据
			if startTime != "" && utils.CompareDate(startTime, indexData.DataTime) {
				edbDataResp = append(edbDataResp, indexData)
			}
		}
	}

	// 计算R2 公式：R2=1-SSE/SST R2越大，越符合线性  R2 = 1 - 残差平方和/总平方和
	R2 = 1 - residualQuadraticSum/totalQuadraticSum

	mappingEdb := make([]EdbInfoList, len(mappingEdbList))
	copy(mappingEdb, mappingEdbList)

	for i, mapping := range mappingEdb {
		if mapping.EdbInfoId != edbInfoMappingA.EdbInfoId {

			toEdbData := convertEdbDataListToEdbData(edbDataResp)

			mappingEdb[i].DataList = toEdbData
			mappingEdb[i].EdbName = edbInfoMappingA.EdbName + "映射残差/" + edbInfoMappingB.EdbName
			if config.IndexType == 2 {
				if config.LeadValue > 0 {
					mappingEdb[i].EdbName = edbInfoMappingA.EdbName + "映射残差/" + edbInfoMappingB.EdbName + "（领先" + strconv.Itoa(config.LeadValue) + config.LeadFrequency + "）"
				}
			}
		}
	}

	return mappingEdb, R2, nil
}

func fillMappingChartInfo(config ResidualAnalysisConfig, req *EdbInfo, edbInfoMappingA *EdbInfoList, edbInfoMappingB *EdbInfoList, originalEdbList []EdbInfoList, indexADataMap map[string]*EdbData, startDate string, endDate string, fullADataList []*EdbDataList, fullBDataList []*EdbDataList) ([]EdbInfoList, float64, float64, float64, error) {
	// 计算公式：Y=aX+b，Y为映射后的指标，X为自变量指标
	// 正序：a=(L2-L1)/(R2-R1)	b=L2-R2*a
	// 逆序：a=(L2-L1)/(R1-R2)	b=L2-R1*a
	// L2：左轴下限 R2：右轴上限 L1：左轴上限 R1：右轴下限
	var a, b, r float64

	// 映射残差 计算a,b
	if config.ResidualType == 1 {
		if config.IsOrder {
			a = (config.LeftIndexMax - config.LeftIndexMin) / (config.RightIndexMin - config.RightIndexMax)
			b = config.LeftIndexMax - config.RightIndexMin*a
		} else {
			a = (config.LeftIndexMax - config.LeftIndexMin) / (config.RightIndexMax - config.RightIndexMin)
			b = config.LeftIndexMax - config.RightIndexMax*a
		}
	}

	dataList := edbInfoMappingB.DataList

	// 指标B数据补充
	// 新建一个切片来保存补充的数据
	var replenishDataList []*EdbData

	for index := 0; index < len(dataList)-1; index++ {
		// 获取当前数据和下一个数据
		beforeIndexData := dataList[index]
		afterIndexData := dataList[index+1]

		// 从最早时间开始，补充时间为自然日
		for utils.IsMoreThanOneDay(beforeIndexData.DataTime, afterIndexData.DataTime) {
			// 创建补充数据
			nextDay := utils.GetNextDay(beforeIndexData.DataTime)
			toTime := utils.StringToTime(nextDay)
			replenishIndexData := EdbData{
				DataTime:      nextDay, // 计算下一个自然日
				DataTimestamp: toTime.UnixMilli(),
				Value:         beforeIndexData.Value, // 可以选择使用前一天的值，或者其他逻辑来计算值
			}

			// 将补充数据加入补充数据列表
			replenishDataList = append(replenishDataList, &replenishIndexData)

			// 更新 beforeIndexData 为新创建的补充数据
			beforeIndexData = &replenishIndexData
		}
	}

	// 将补充数据插入原始数据列表
	dataList = append(dataList, replenishDataList...)

	// 排序
	sort.Sort(ByDataTime(dataList))

	// 拟合残差 计算a,b
	var coordinateList []utils.Coordinate
	var replenishADataList []*EdbDataList
	var replenishBDataList []*EdbDataList
	if config.ResidualType == 2 {
		//

		// 因变量指标也转换为日度
		for index := 0; index < len(fullADataList)-1; index++ {
			// 获取当前数据和下一个数据
			beforeIndexData := fullADataList[index]
			afterIndexData := fullADataList[index+1]

			replenishADataList = append(replenishADataList, beforeIndexData)
			// 从最早时间开始，补充时间为自然日
			if utils.IsMoreThanOneDay(beforeIndexData.DataTime, afterIndexData.DataTime) {
				for {
					// 创建补充数据
					nextDay := utils.GetNextDay(beforeIndexData.DataTime)
					toTime := utils.StringToTime(nextDay)
					replenishIndexData := EdbDataList{
						DataTime:      nextDay, // 计算下一个自然日
						DataTimestamp: toTime.UnixMilli(),
						Value:         beforeIndexData.Value, // 可以选择使用前一天的值，或者其他逻辑来计算值
					}

					// 将补充数据加入补充数据列表
					replenishADataList = append(replenishADataList, &replenishIndexData)

					// 更新 beforeIndexData 为新创建的补充数据
					beforeIndexData = &replenishIndexData

					// 检查是否还需要继续补充数据
					if !utils.IsMoreThanOneDay(beforeIndexData.DataTime, afterIndexData.DataTime) {
						break
					}
				}
			}
		}
		replenishADataList = append(replenishADataList, fullADataList[len(fullADataList)-1])

		// 自变量指标也转换为日度
		for index := 0; index < len(fullBDataList)-1; index++ {
			// 获取当前数据和下一个数据
			beforeIndexData := fullBDataList[index]
			afterIndexData := fullBDataList[index+1]

			replenishBDataList = append(replenishBDataList, beforeIndexData)
			// 从最早时间开始，补充时间为自然日
			if utils.IsMoreThanOneDay(beforeIndexData.DataTime, afterIndexData.DataTime) {
				for {
					// 创建补充数据
					nextDay := utils.GetNextDay(beforeIndexData.DataTime)
					toTime := utils.StringToTime(nextDay)
					replenishIndexData := EdbDataList{
						DataTime:      nextDay, // 计算下一个自然日
						DataTimestamp: toTime.UnixMilli(),
						Value:         beforeIndexData.Value, // 可以选择使用前一天的值，或者其他逻辑来计算值
					}

					// 将补充数据加入补充数据列表
					replenishBDataList = append(replenishBDataList, &replenishIndexData)

					// 更新 beforeIndexData 为新创建的补充数据
					beforeIndexData = &replenishIndexData

					// 检查是否还需要继续补充数据
					if !utils.IsMoreThanOneDay(beforeIndexData.DataTime, afterIndexData.DataTime) {
						break
					}
				}
			}
		}
		replenishBDataList = append(replenishBDataList, fullBDataList[len(fullBDataList)-1])

		// replenishADataList --> map
		replenishADataMap := make(map[string]*EdbDataList)
		for _, indexData := range replenishADataList {
			if (utils.StringToTime(indexData.DataTime).After(utils.StringToTime(startDate)) || utils.StringToTime(indexData.DataTime).Equal(utils.StringToTime(startDate))) && (endDate == "" || utils.StringToTime(indexData.DataTime).Before(utils.StringToTime(endDate))) {
				replenishADataMap[indexData.DataTime] = indexData
			}
		}

		for _, indexData := range replenishBDataList {
			if _, ok := replenishADataMap[indexData.DataTime]; ok {

				coordinate := utils.Coordinate{
					X: indexData.Value,
					Y: replenishADataMap[indexData.DataTime].Value,
				}
				coordinateList = append(coordinateList, coordinate)
			}
		}
		a, b = utils.GetLinearResult(coordinateList)
		r = utils.ComputeCorrelation(coordinateList)
	}

	// 填充映射指标值 使得时间长度一致
	dataList = FillDataBList(dataList, edbInfoMappingA)

	// 根据指标A的时间key，在B的映射指标中筛选出对应的值
	var dataBList []*EdbDataList

	var indexMax, indexMin string

	if len(dataList) > 0 {
		indexMax = dataList[0].Value
		indexMin = dataList[0].Value
		for _, indexData := range dataList {
			if _, ok := indexADataMap[indexData.DataTime]; ok {
				indexDataCopy := *indexData

				// 计算指标B映射值
				f, _ := strconv.ParseFloat(indexData.Value, 64)
				indexDataCopy.Value = fmt.Sprintf("%f", math.Round((a*f+b)*10000)/10000)

				// 比较最大值
				if indexData.Value > indexMax {
					indexMax = indexData.Value
				}

				// 比较最小值
				if indexData.Value < indexMin {
					indexMin = indexData.Value
				}

				// 将副本添加到 dataBList
				copyValue, _ := strconv.ParseFloat(indexDataCopy.Value, 64)
				dataBList = append(dataBList, &EdbDataList{
					DataTime:      indexDataCopy.DataTime,
					DataTimestamp: indexDataCopy.DataTimestamp,
					EdbDataId:     indexDataCopy.EdbDataId,
					EdbInfoId:     indexDataCopy.EdbInfoId,
					Value:         copyValue,
				})
			}
		}
	}

	mappingEdbList := make([]EdbInfoList, len(originalEdbList))
	copy(mappingEdbList, originalEdbList)

	for i, mapping := range mappingEdbList {
		if mapping.EdbInfoId != edbInfoMappingA.EdbInfoId {
			mappingEdbList[i].EdbInfoId = 0
			mappingEdbList[i].EdbCode = ""
			mappingEdbList[i].EdbName = edbInfoMappingB.EdbName + "映射" + edbInfoMappingA.EdbName
			if config.IndexType == 2 {
				if config.LeadValue > 0 {
					mappingEdbList[i].EdbName = edbInfoMappingB.EdbName + "映射" + edbInfoMappingA.EdbName + "（领先" + strconv.Itoa(config.LeadValue) + config.LeadFrequency + "）"
				}
			}

			edbData := convertEdbDataListToEdbData(dataBList)

			mappingEdbList[i].DataList = edbData
		}
	}
	return mappingEdbList, a, b, r, nil
}

// FillDataBList 填充B的数据 使得与A的时间保持一致
func FillDataBList(dataList []*EdbData, edbInfoMappingA *EdbInfoList) []*EdbData {
	dataAList := edbInfoMappingA.DataList

	for utils.StringToTime(dataList[len(dataList)-1].DataTime).Before(utils.StringToTime(dataAList[len(dataAList)-1].DataTime)) {
		// 使用A的时间填充时间差
		timeDiff := utils.GetNextDayN(dataList[len(dataList)-1].DataTime, 1)

		// 创建新的数据点并填充 前值填充
		newDataPoint := &EdbData{
			DataTime:      timeDiff,
			Value:         dataList[len(dataList)-1].Value,
			DataTimestamp: utils.StringToTime(timeDiff).UnixMilli(),
		}

		// 将新数据点添加到dataList末尾
		dataList = append(dataList, newDataPoint)
	}

	return dataList
}

func fillOriginalChart(config ResidualAnalysisConfig, req *EdbInfo, mappingList []*EdbInfoList, startDate string, endDate string, edbInfoMappingA *EdbInfoList, edbInfoMappingB *EdbInfoList, originalEdbList []EdbInfoList) ([]EdbInfoList, []*EdbDataList, []*EdbDataList, error) {

	var fullADataList, fullBDataList []*EdbDataList
	for _, v := range mappingList {
		var edbInfoMapping EdbInfoList
		edbInfoMapping.EdbName = v.EdbName

		// 获取图表中的指标数据
		dataList, err := GetEdbDataList(v.Source, v.SubSource, v.EdbInfoId, startDate, endDate)
		if err != nil {
			return nil, nil, nil, fmt.Errorf("获取指标数据失败，Err:%s", err.Error())
		}
		data := convertEdbDataListToEdbData(dataList)
		// 重新获取指标数据 产品要求需要和计算指标-拟合残差逻辑保持一致
		fullDataList, err := GetEdbDataList(v.Source, v.SubSource, v.EdbInfoId, "", "")
		if err != nil {
			return nil, nil, nil, fmt.Errorf("获取指标数据失败，Err:%s", err.Error())
		}

		if v.EdbInfoId == edbInfoMappingB.EdbInfoId {
			// 领先指标 dataList进行数据处理
			if config.IndexType == 1 {
				if config.LeadValue < 0 {
					return nil, nil, nil, fmt.Errorf("领先值不能小于0")
				} else if config.LeadValue > 0 {
					edbInfoMapping.EdbName = v.EdbName + "（领先" + strconv.Itoa(config.LeadValue) + config.LeadFrequency + "）"
					for _, indexData := range dataList {
						switch config.LeadFrequency {
						case "天":
							indexData.DataTime = utils.GetNextDayN(indexData.DataTime, config.LeadValue)
						case "周":
							indexData.DataTime = utils.GetNextDayN(indexData.DataTime, config.LeadValue*7)
						case "月":
							indexData.DataTime = utils.TimeToString(utils.AddDate(utils.StringToTime(indexData.DataTime), 0, config.LeadValue), utils.YearMonthDay)
						case "季":
							indexData.DataTime = utils.TimeToString(utils.AddDate(utils.StringToTime(indexData.DataTime), 0, config.LeadValue*3), utils.YearMonthDay)
						case "年":
							indexData.DataTime = utils.TimeToString(utils.AddDate(utils.StringToTime(indexData.DataTime), config.LeadValue, 0), utils.YearMonthDay)
						}
						indexData.DataTimestamp = utils.StringToTime(indexData.DataTime).UnixMilli()
					}
				}
			}
			edbInfoMappingB.DataList = data
			fullBDataList = fullDataList
		} else {
			edbInfoMappingA.DataList = data
			fullADataList = fullDataList
		}
		edbInfoMapping.EdbInfoId = v.EdbInfoId
		edbInfoMapping.EdbCode = v.EdbCode
		edbInfoMapping.Unit = v.Unit
		edbInfoMapping.Frequency = v.Frequency
		edbInfoMapping.Source = v.Source
		edbInfoMapping.SourceName = v.SourceName
		edbInfoMapping.LatestDate = v.LatestDate
		edbInfoMapping.LatestValue = v.LatestValue

		edbInfoMapping.DataList = data
		originalEdbList = append(originalEdbList, edbInfoMapping)
	}
	return originalEdbList, fullADataList, fullBDataList, nil
}

func convertEdbDataListToEdbData(edbDataLists []*EdbDataList) []*EdbData {
	var edbDataList []*EdbData
	for _, edbData := range edbDataLists {
		data := &EdbData{
			DataTime:      edbData.DataTime,
			DataTimestamp: edbData.DataTimestamp,
			EdbDataId:     edbData.EdbDataId,
			EdbInfoId:     edbData.EdbInfoId,
			Value:         fmt.Sprintf("%f", edbData.Value),
		}
		edbDataList = append(edbDataList, data)
	}
	return edbDataList
}

type ByDataTime []*EdbData

func (a ByDataTime) Len() int {
	return len(a)
}

func (a ByDataTime) Swap(i, j int) {
	a[i], a[j] = a[j], a[i]
}

func (a ByDataTime) Less(i, j int) bool {
	t1 := utils.StringToTime(a[i].DataTime)
	t2 := utils.StringToTime(a[j].DataTime)
	return t1.Before(t2)
}