hongze_task/services/data/trade_position_analysis.go

package data

import (
	"context"
	"fmt"
	"hongze/hongze_task/models/data_manage"
	"hongze/hongze_task/services/alarm_msg"
	"hongze/hongze_task/utils"
	"sort"
	"strconv"
	"time"
)

// InitPositionTask 统计今日交易所的持仓分析数据
func InitPositionTask(cont context.Context) (err error) {
	exchanges := []string{"zhengzhou", "dalian", "shanghai", "cffex", "ine"} //郑商所，大商所，上期所，中金所，上期能源
	for i := 1; i >= 0; i-- {
		startDate := time.Now().AddDate(0, 0, -i).Format(utils.FormatDate)
		endDate := startDate
		for _, v := range exchanges {
			exchange := v
			err = nil
			fmt.Println("InitPositionTask:	启动：" + exchange)
			utils.FileLog.Info("InitPositionTask:	启动：" + exchange)

			fmt.Println("开始" + startDate + "结束" + endDate)
			utils.FileLog.Info(fmt.Sprintf("InitTradePosition:开始:%s; 结束:%s", startDate, endDate))
			tErr, errMsg := InitTradePosition(exchange, startDate, endDate)
			if tErr != nil {
				err = tErr
				fmt.Println("InitTradePosition: 操作失败：" + errMsg + tErr.Error())
				utils.FileLog.Info(fmt.Sprintf("InitTradePosition: 操作失败：%s:%s", errMsg, tErr.Error()))
				continue
			}

			fmt.Println("InitTradePosition:" + exchange + "已完成")
			utils.FileLog.Info("InitTradePosition:" + exchange + "已完成")
		}
	}

	// 处理交易所的分类
	{
		allBaseFromTradeClassify, tmpErr := data_manage.GetAllBaseFromTradeClassify()
		if tmpErr != nil {
			utils.FileLog.Info(fmt.Sprintf("获取所有交易所分类失败，;err:%s", tmpErr.Error()))
			return
		}
		tradeClassifyMap := make(map[string]*data_manage.BaseFromTradeClassify)
		for _, v := range allBaseFromTradeClassify {
			key := fmt.Sprintf("%s_%s_%s", v.Exchange, v.ClassifyName, v.ClassifyType)
			tradeClassifyMap[key] = v
		}

		baseFromTradeClassifyList := make([]*data_manage.BaseFromTradeClassify, 0)
		for _, v := range exchanges {
			tradeClassifyNameList, tmpErr := data_manage.GetExchangeClassify(v)
			if tmpErr != nil {
				utils.FileLog.Info(fmt.Sprintf("获取%s分类失败，;err:%s", v, tmpErr.Error()))
				continue
			}

			for _, classify := range tradeClassifyNameList {
				key := fmt.Sprintf("%s_%s_%s", v, classify.ClassifyName, classify.ClassifyType)

				if tradeClassify, ok := tradeClassifyMap[key]; !ok {
					baseFromTradeClassifyList = append(baseFromTradeClassifyList, &data_manage.BaseFromTradeClassify{
						Id:           0,
						ClassifyName: classify.ClassifyName,
						ClassifyType: classify.ClassifyType,
						Exchange:     v,
						LatestDate:   classify.DataTime,
						CreateTime:   time.Now(),
						ModifyTime:   classify.ModifyTime,
					})
				} else {
					if tradeClassify.LatestDate.Before(classify.DataTime) {
						tradeClassify.LatestDate = classify.DataTime
						tradeClassify.ModifyTime = classify.ModifyTime
						tradeClassify.Update([]string{"LatestDate", "ModifyTime"})
					}
				}
			}
		}

		lenAddList := len(baseFromTradeClassifyList)
		if lenAddList > 0 {
			baseAddNum := 500
			num := lenAddList / baseAddNum
			lastNum := lenAddList % baseAddNum
			for i := 0; i <= num; i++ {
				tmpNum := baseAddNum
				if i == num && lastNum > 0 {
					tmpNum = lastNum
				}
				data_manage.MultiAddBaseFromTradeClassify(baseFromTradeClassifyList[i*baseAddNum : (i*baseAddNum + tmpNum)])
			}
		}
	}

	return
}

func InitTradePosition(exchange, startDate, endDate string) (err error, errMsg string) {
	defer func() {
		if err != nil {
			tips := fmt.Sprintf("统计今日交易所的持仓分析数据失败, Exchange: %s, Err: %s, Msg: %s", exchange, err.Error(), errMsg)
			alarm_msg.SendAlarmMsg(tips, 3)
		}
	}()

	// 批量插入今日的初始值
	num, err := data_manage.GetTradePositionTopCountByExchangeDataTime(exchange, startDate, endDate)
	if err != nil {
		errMsg = "查询原始数据失败，GetTradePositionTopCountByExchangeDataTime() Err: "
		return
	}
	if num > 0 {
		//err = fmt.Errorf("数据已存在，无需处理")
		return
	}
	err = data_manage.MultiInsertTradeBaseDataToTop(exchange, startDate, endDate)
	if err != nil {
		errMsg = "新增原始数据失败，MultiInsertTradeBaseDataToTop() Err: "
		return
	}
	originList, err := data_manage.GetTradePositionTopByExchangeDataTime(exchange, startDate, endDate)
	if err != nil {
		errMsg = "查询原始数据失败， GetTradePositionTopByExchangeDataTime() Err: "
		return
	}
	if len(originList) <= 0 {
		// 忽略周末
		w := time.Now().Weekday().String()
		if w == "Saturday" || w == "Sunday" {
			return
		}
		// 每天最后一个小时执行依旧无数据时, 才进行邮件提示
		if time.Now().Hour() != 23 {
			return
		}
		err = fmt.Errorf("原始数据没有值")
		return
	}

	// 原始数据日期
	dates, e := data_manage.GetTradePositionTopOriginDataTimes(exchange)
	if e != nil {
		err = fmt.Errorf("GetTradePositionTopOriginDataTimes err: %s", e.Error())
		return
	}

	now := time.Now()
	dataTimeMap := make(map[string]*data_manage.TradePositionTop)
	onlyEmptyMap := make(map[string]bool)
	onlyEmptyNameMap := make(map[string]*data_manage.TradePositionTop)
	topLastMap := make(map[string]int)
	topLastRankMap := make(map[string]int)
	list := make([]*data_manage.TradePositionTop, 0)
	for _, v := range originList {
		tmp0, tmpErr := dealTradeOriginData(dataTimeMap, onlyEmptyMap, onlyEmptyNameMap, v, topLastMap, topLastRankMap, startDate, now, dates)
		if tmpErr != nil {
			err = tmpErr
			errMsg = "处理原始数据失败 dealTradeOriginData() Err: "
			return
		}
		if tmp0 != nil {
			list = append(list, tmp0)
		}
		if len(list) >= 1000 {
			err = data_manage.InsertMultiTradePositionTop(exchange, list)
			if err != nil {
				errMsg = "批量新增昨日数据失败，InsertMultiTradePositionTop() Err: "
				return
			}
			list = make([]*data_manage.TradePositionTop, 0)
		}
	}
	if len(list) > 0 {
		err = data_manage.InsertMultiTradePositionTop(exchange, list)
		if err != nil {
			errMsg = "批量新增昨日数据失败，InsertMultiTradePositionTop() Err: "
			return
		}
		list = make([]*data_manage.TradePositionTop, 0)
	}
	// 处理某个期货公司只有买单没有卖单，或者只有卖单没有买单的情况
	for k, v := range onlyEmptyNameMap {
		_, ok1 := onlyEmptyMap[k+"_1"]
		_, ok2 := onlyEmptyMap[k+"_2"]
		var dealType int
		if ok1 && !ok2 {
			dealType = 2 //只有买单没有卖单
		} else if !ok1 && ok2 {
			dealType = 1 //只有卖单没有买单的情况
		} else {
			continue
		}
		if dealType > 0 {
			str := v.ClassifyName + "_" + v.ClassifyType + "_" + v.DataTime + "_" + strconv.Itoa(dealType)
			dealValue := 0
			if lastVal, ok := topLastMap[str]; ok {
				dealValue = int(float64(lastVal)*0.7 + 0.5)
			}

			tmp := &data_manage.TradePositionTop{
				ClassifyName:  v.ClassifyName,
				ClassifyType:  v.ClassifyType,
				DealShortName: v.DealShortName,
				DataTime:      v.DataTime,
				DealValue:     dealValue,
				CreateTime:    now,
				ModifyTime:    now,
				DealType:      dealType,
				SourceType:    2,
			}
			list = append(list, tmp)
			if len(list) >= 1000 {
				err = data_manage.InsertMultiTradePositionTop(exchange, list)
				if err != nil {
					errMsg = "批量新增前日数据失败，InsertMultiTradePositionTop() Err: "
					return
				}
				list = make([]*data_manage.TradePositionTop, 0)
			}
		}
	}

	if len(list) > 0 {
		err = data_manage.InsertMultiTradePositionTop(exchange, list)
		if err != nil {
			errMsg = "批量新增前日数据失败，InsertMultiTradePositionTop() Err: "
			return
		}
	}

	//生成净多单，净空单榜单
	err = createAnalysisCleanTop(exchange, startDate, endDate)
	if err != nil {
		errMsg = "创建净多单，净空单数据失败，createAnalysisCleanTop() Err: "
		return
	}
	// 特殊处理起始日期前一天的数据
	err = DealYesterdayData(exchange, startDate)
	if err != nil {
		errMsg = "处理昨日数据失败，DealYesterdayData() Err: "
		return
	}
	return
}

func dealTradeOriginData(dataTimeMap map[string]*data_manage.TradePositionTop, onlyEmptyMap map[string]bool, onlyEmptyNameMap map[string]*data_manage.TradePositionTop, currentItem *data_manage.TradePositionTop, topLastMap map[string]int, topLastRankMap map[string]int, startDate string, now time.Time, dates []string) (tmp0 *data_manage.TradePositionTop, err error) {
	classifyName := currentItem.ClassifyName
	classifyType := currentItem.ClassifyType
	dealShortName := currentItem.DealShortName
	dealValue := currentItem.DealValue
	dealChange := currentItem.DealChange
	dataTime := currentItem.DataTime
	dealType := currentItem.DealType
	dealTypeStr := strconv.Itoa(dealType)
	dataTimeMap[classifyName+"_"+classifyType+"_"+dealTypeStr+"_"+dealShortName+"_"+dataTime] = currentItem
	onlyEmptyMap[classifyName+"_"+classifyType+"_"+dataTime+"_"+dealShortName+"_"+dealTypeStr] = true
	onlyEmptyNameMap[classifyName+"_"+classifyType+"_"+dataTime+"_"+dealShortName] = currentItem
	if currentItem.Rank > topLastRankMap[classifyName+"_"+classifyType+"_"+dataTime+"_"+dealTypeStr] {
		topLastMap[classifyName+"_"+classifyType+"_"+dataTime+"_"+dealTypeStr] = dealValue
		topLastRankMap[classifyName+"_"+classifyType+"_"+dataTime+"_"+dealTypeStr] = currentItem.Rank
	}
	if dataTime > startDate {
		//tmpTimeStr, tErr := getYesterdayDate(dataTime)
		//if tErr != nil {
		//	err = tErr
		//	return
		//}
		tmpTimeStr := getPrevTradeDataDate(dataTime, dates)
		if tmpTimeStr < startDate {
			return
		}
		// 判断T-1日是否有值, 如果T-1日为空，则根据T日的值计算出T-1的值
		if _, ok := dataTimeMap[classifyName+"_"+classifyType+"_"+dealTypeStr+"_"+dealShortName+"_"+tmpTimeStr]; !ok {
			yesterdayVal := dealValue - dealChange
			yesterdayChange := 0
			//beforeYesterday, _ := getYesterdayDate(tmpTimeStr)
			beforeYesterday := getPrevTradeDataDate(tmpTimeStr, dates)
			beforeYesterdayItem, ok1 := dataTimeMap[classifyName+"_"+classifyType+"_"+dealTypeStr+"_"+dealShortName+"_"+beforeYesterday]
			if ok1 {
				yesterdayChange = yesterdayVal - beforeYesterdayItem.DealValue
			}
			tmp0 = &data_manage.TradePositionTop{
				ClassifyName:  classifyName,
				ClassifyType:  classifyType,
				DealShortName: dealShortName,
				DealValue:     yesterdayVal,
				DealChange:    yesterdayChange,
				DataTime:      tmpTimeStr,
				CreateTime:    now,
				ModifyTime:    now,
				DealType:      dealType,
				SourceType:    1,
			}
			dataTimeMap[classifyName+"_"+classifyType+"_"+dealTypeStr+"_"+dealShortName+"_"+tmpTimeStr] = tmp0
			onlyEmptyMap[classifyName+"_"+classifyType+"_"+tmpTimeStr+"_"+dealShortName+"_"+dealTypeStr] = true
			onlyEmptyNameMap[classifyName+"_"+classifyType+"_"+tmpTimeStr+"_"+dealShortName] = tmp0
		}
	}
	return
}

// DealYesterdayData 更新昨日数据
func DealYesterdayData(exchange, startDate string) (err error) {
	// 查询最早的日期
	firstItem, err := data_manage.GetFirstBaseFromTradeIndexByDate(exchange)
	if err != nil {
		return
	}
	if startDate == firstItem.DataTime { //如果当前是起始日，则无需统计修改前一天的数据
		return
	}

	// 前一个交易日, 前两个交易日
	dates, e := data_manage.GetTradePositionTopOriginDataTimes(exchange)
	if e != nil {
		err = fmt.Errorf("GetTradePositionTopOriginDataTimes err: %s", e.Error())
		return
	}
	yesterdayStr := getPrevTradeDataDate(startDate, dates)
	beforeYesterdayStr := getPrevTradeDataDate(yesterdayStr, dates)

	//yesterdayStr, err := getYesterdayDate(startDate)
	//if err != nil {
	//	return
	//}
	////查找前日的值，并更新对应的更改
	//beforeYesterdayStr, err := getYesterdayDate(yesterdayStr)
	//if err != nil {
	//	return
	//}
	// 先查出T日最原始的数据
	originList, err := data_manage.GetTradePositionTopByExchangeDataTime(exchange, startDate, startDate)
	if err != nil {
		return
	}
	originBuyMap := make(map[string]*data_manage.TradePositionTop)
	originSoldMap := make(map[string]*data_manage.TradePositionTop)
	for _, v := range originList {
		if v.SourceType != 0 {
			continue
		}
		str := v.ClassifyName + "_" + v.ClassifyType + "_" + v.DealShortName
		if v.DealType == 1 {
			originBuyMap[str] = v
		} else if v.DealType == 2 {
			originSoldMap[str] = v
		}
	}

	// 然后查询T-1中数据来源类型是2的数据
	changeList, err := data_manage.GetTradePositionTopByExchangeSourceType(exchange, yesterdayStr, 2)
	if err != nil {
		return
	}
	if len(changeList) <= 0 {
		//err = fmt.Errorf("前天的数据无需修改")
		return
	}
	// 查询出前日的成交量
	beforeYesterdayList, err := data_manage.GetTradePositionTopByExchangeDataTime(exchange, beforeYesterdayStr, beforeYesterdayStr)
	if err != nil {
		return
	}
	beforeYesterdayMap1 := make(map[string]int)
	beforeYesterdayMap2 := make(map[string]int)
	if len(beforeYesterdayList) > 0 {
		for _, v := range beforeYesterdayList {
			if v.SourceType == 2 {
				continue
			}
			str := v.ClassifyName + "_" + v.ClassifyType + "_" + v.DealShortName
			if v.DealType == 1 {
				beforeYesterdayMap1[str] = v.DealValue
			} else if v.DealType == 2 {
				beforeYesterdayMap2[str] = v.DealValue
			}
		}
	}
	// 根据原始数据中的值推算出最新的值
	now := time.Now()
	// 批量更新到分析表中，
	var updateAnalysisData []data_manage.UpdateDealValueChange
	for _, v := range changeList {
		str := v.ClassifyName + "_" + v.ClassifyType + "_" + v.DealShortName
		dealValue := 0
		dealChange := 0
		if v.DealType == 1 {
			if n, ok := originBuyMap[str]; ok {
				dealValue = n.DealValue - n.DealChange
				if beforeVal, ok1 := beforeYesterdayMap1[str]; ok1 {
					dealChange = dealValue - beforeVal
				}
				tmp := data_manage.UpdateDealValueChange{
					Id:         v.Id,
					DealValue:  dealValue,
					DealChange: dealChange,
					SourceType: 1,
					ModifyTime: now,
				}
				updateAnalysisData = append(updateAnalysisData, tmp)
			}
		} else if v.DealType == 2 {
			if n, ok := originSoldMap[str]; ok {
				dealValue = n.DealValue - n.DealChange
				if beforeVal, ok1 := beforeYesterdayMap2[str]; ok1 {
					dealChange = dealValue - beforeVal
				}
				tmp := data_manage.UpdateDealValueChange{
					Id:         v.Id,
					DealValue:  dealValue,
					DealChange: dealChange,
					SourceType: 1,
					ModifyTime: now,
				}
				updateAnalysisData = append(updateAnalysisData, tmp)
			}
		}
	}
	if len(updateAnalysisData) > 0 {
		err = data_manage.MultiUpdatePositionTop(exchange, updateAnalysisData)
		if err != nil {
			return
		}
		//删除T-1日净多单和净空单的榜单
		err = data_manage.DeletePositionTopByDataTime(exchange, yesterdayStr, 3)
		if err != nil {
			return
		}

		err = data_manage.DeletePositionTopByDataTime(exchange, yesterdayStr, 4)
		if err != nil {
			return
		}

		//重新生成净多单和净空单的榜单
		err = createAnalysisCleanTop(exchange, yesterdayStr, yesterdayStr)
		if err != nil {
			return
		}
	}

	return
}

// createAnalysisCleanTop 生成净多单，净空单榜单
func createAnalysisCleanTop(exchange, startDate, endDate string) (err error) {
	defer func() {
		if err != nil {
			fmt.Println("createAnalysisCleanTop err: " + err.Error())
		}
	}()

	topList := make([]*data_manage.TradePositionTop, 0)
	now := time.Now()
	var subDataList data_manage.TradePositionSubList

	subChangeMap1 := make(map[string]int) //净多单map
	subChangeMap2 := make(map[string]int) //净空单map

	// 2023-05-10 此处取前一个交易日, 不一定是昨日
	dates, e := data_manage.GetTradePositionTopOriginDataTimes(exchange)
	if e != nil {
		err = fmt.Errorf("GetTradePositionTopOriginDataTimes err: %s", e.Error())
		return
	}
	yesterday := getPrevTradeDataDate(startDate, dates)

	//查询所有差值数据，
	//yesterday, err := getYesterdayDate(startDate)
	//if err != nil {
	//	return
	//}

	// 上一个交易日的净多单
	yesterdayTopList1, tErr := data_manage.GetTradePositionTopByExchangeDataTimeType(exchange, yesterday, 3)
	if tErr != nil {
		err = tErr
		return
	}
	if len(yesterdayTopList1) > 0 {
		for _, v := range yesterdayTopList1 {
			nameStr := v.ClassifyName + "_" + v.ClassifyType + "_" + v.DataTime + "_" + v.DealShortName
			subChangeMap1[nameStr] = v.DealValue
		}
	}

	// 上一个交易日的净空单
	yesterdayTopList2, tErr := data_manage.GetTradePositionTopByExchangeDataTimeType(exchange, yesterday, 4)
	if tErr != nil {
		err = tErr
		return
	}
	if len(yesterdayTopList2) > 0 {
		for _, v := range yesterdayTopList2 {
			nameStr := v.ClassifyName + "_" + v.ClassifyType + "_" + v.DataTime + "_" + v.DealShortName
			subChangeMap2[nameStr] = v.DealValue
		}
	}

	// 根据当日多单/空单数据, 生成净多单/净空单数据
	originDataList, err := data_manage.GetTradePositionTopByExchangeDataTime(exchange, startDate, endDate)
	if err != nil {
		return
	}
	buyDataMap := make(map[string]int)
	for _, v := range originDataList {
		str := v.ClassifyName + "_" + v.ClassifyType + "_" + v.DataTime + "_" + v.DealShortName
		if v.DealType == 1 {
			buyDataMap[str] = v.DealValue
		} else if v.DealType == 2 {
			subValue := 0
			dealType := 0
			if buy, ok := buyDataMap[str]; ok {
				subValue = buy - v.DealValue
				if subValue >= 0 {
					dealType = 3
				} else {
					subValue = -subValue
					dealType = 4
				}
			}
			tmp := &data_manage.TradePositionSub{
				ClassifyName:  v.ClassifyName,
				ClassifyType:  v.ClassifyType,
				DataTime:      v.DataTime,
				DealShortName: v.DealShortName,
				SubValue:      subValue,
				DealType:      dealType,
			}
			subDataList = append(subDataList, tmp)
		}
	}
	if len(subDataList) > 0 {
		sort.Sort(subDataList)
	}

	// 根据净多单/净空单数据, 比对上一个交易日的日期计算成交变化量, 并写入
	var dealType int
	rankMap := make(map[string]int)
	for _, v := range subDataList {
		subValue := v.SubValue
		nameStr := v.ClassifyName + "_" + v.ClassifyType + "_" + v.DataTime + "_" + v.DealShortName
		if v.DealType == 3 {
			subChangeMap1[nameStr] = subValue
			dealType = 3
			if _, ok := rankMap[v.ClassifyName+"_"+v.ClassifyType+"_"+v.DataTime+"_3"]; !ok {
				rankMap[v.ClassifyName+"_"+v.ClassifyType+"_"+v.DataTime+"_3"] = 1
			} else {
				rankMap[v.ClassifyName+"_"+v.ClassifyType+"_"+v.DataTime+"_3"]++
			}
		} else if v.DealType == 4 {
			subChangeMap2[nameStr] = subValue
			dealType = 4
			if _, ok := rankMap[v.ClassifyName+"_"+v.ClassifyType+"_"+v.DataTime+"_4"]; !ok {
				rankMap[v.ClassifyName+"_"+v.ClassifyType+"_"+v.DataTime+"_4"] = 1
			} else {
				rankMap[v.ClassifyName+"_"+v.ClassifyType+"_"+v.DataTime+"_4"]++
			}
		}

		// 2023-05-10 目前看该方法的引用startDate和endDate其实是同一天, 所以前一个交易日直接用上面的yesterday
		tmpTimeStr := yesterday

		//和T-1日比较差值
		//var tmpTimeStr string
		//tmpTimeStr, err = getYesterdayDate(v.DataTime)
		//if err != nil {
		//	return
		//}
		yesterdayStr := v.ClassifyName + "_" + v.ClassifyType + "_" + tmpTimeStr + "_" + v.DealShortName
		dealChange := 0
		if dealType == 3 {
			if c, ok := subChangeMap1[yesterdayStr]; ok {
				dealChange = subValue - c
			}
		} else if dealType == 4 {
			if c, ok := subChangeMap2[yesterdayStr]; ok {
				dealChange = subValue - c
			}
		}
		tmp := &data_manage.TradePositionTop{
			ClassifyName:  v.ClassifyName,
			ClassifyType:  v.ClassifyType,
			DataTime:      v.DataTime,
			CreateTime:    now,
			ModifyTime:    now,
			DealShortName: v.DealShortName,
			DealValue:     subValue,
			DealChange:    dealChange,
			DealType:      dealType,
			Rank:          rankMap[v.ClassifyName+"_"+v.ClassifyType+"_"+v.DataTime+"_"+strconv.Itoa(dealType)],
		}
		topList = append(topList, tmp)
		if len(topList) >= 1000 {
			err = data_manage.InsertMultiTradePositionTop(exchange, topList)
			if err != nil {
				return
			}
			topList = make([]*data_manage.TradePositionTop, 0)
		}
	}

	if len(topList) >= 0 {
		err = data_manage.InsertMultiTradePositionTop(exchange, topList)
		if err != nil {
			return
		}
	}
	return
}

func getYesterdayDate(today string) (yesterday string, err error) {
	i := 1
	tmpTime, err := time.ParseInLocation(utils.FormatDate, today, time.Local)
	if err != nil {
		return
	}
	tmpTimeDate := tmpTime.AddDate(0, 0, -i)
	weekStr := tmpTimeDate.Weekday().String()
	if weekStr == "Sunday" {
		i += 2
	} else if weekStr == "Saturday" {
		i += 1
	}
	tmpTimeDate = tmpTime.AddDate(0, 0, -i)
	yesterday = tmpTimeDate.Format(utils.FormatDate)
	return
}

// getPrevTradeDataDate 获取指定日期上一个交易日日期
func getPrevTradeDataDate(date string, dates []string) string {
	pre := -1
	for k, v := range dates {
		n := k - 1
		if v == date && n >= 0 {
			pre = n
			break
		}
	}
	// 找不到就随便给个不存在日期
	if pre == -1 {
		return "1980-01-01"
	}
	return dates[pre]
}