按月统计修改

@@ -706,21 +706,33 @@ func histogramStatisticsByMonth(start time.Time) ([]queryItem, []string) {
 	var monthEnd = time.Date(year, month+1, 1, 0, 0, 0, 0, time.Local).Add(-time.Second)
 	var xAxisData []string
 	for {
-		if beginTime.AddDate(0, 0, increaseDay).After(monthEnd) {
+		currentIncreaseDay := increaseDay
+		leftDay := monthEnd.Day() - endTime.Day()
+		if leftDay == 0 {
+			break
+		}
+		// 不足5天的情况，比如二月 28、29天
+		if leftDay > 0 && leftDay < increaseDay {
+			currentIncreaseDay = leftDay
+		}
+		if beginTime.AddDate(0, 0, currentIncreaseDay).After(monthEnd) {
 			endTime = monthEnd
 			break
 		} else {
-			endTime = beginTime.AddDate(0, 0, increaseDay).Add(-time.Second)
+			endTime = beginTime.AddDate(0, 0, currentIncreaseDay).Add(-time.Second)
 		}
 		item := queryItem{
 			BeginTime: beginTime,
-			EndTime:   beginTime.AddDate(0, 0, increaseDay).Add(-time.Second),
+			EndTime:   beginTime.AddDate(0, 0, currentIncreaseDay).Add(-time.Second),
+		}
+		// 30号接近月末时，如果有31号 就取月末值
+		left := monthEnd.Day() - item.EndTime.Day()
+		if left <= 1 {
+			item.EndTime = monthEnd
+			endTime = monthEnd
 		}
 		xAxisData = append(xAxisData, item.EndTime.Format("01-02"))
 		beginTime = endTime
-		if endTime == monthEnd {
-			break
-		}
 		ret = append(ret, item)
 	}
 	return ret, xAxisData

+package domain_service
+
+import (
+	"fmt"
+	"log"
+	"testing"
+	"time"
+)
+
+func Test_histogramStatisticsByMonth(t *testing.T) {
+	input := time.Date(2021, 1, 1, 0, 0, 0, 0, time.Local)
+
+	for i := 0; i < 12; i++ {
+		y, x := histogramStatisticsByMonth(input)
+		log.Println(fmt.Sprintf("月份:%d", input.Month()), x)
+		log.Println(fmt.Sprintf("月份:%d", input.Month()), y)
+		input = input.AddDate(0, 1, 0)
+	}
+}