enhance(calculate): 完善计算部分

tools/time.go

@@ -1,16 +0,0 @@
-package tools
-
-import (
-	"time"
-)
-
-func DifferenceInMonth(t1, t2 time.Time) int {
-	var differYear, differMonth int
-	differYear = t1.Year() - t2.Year()
-	differMonth = int(t1.Month() - t2.Month())
-	return differYear*12 + differMonth
-}
-
-func IsNextMonth(origin, t time.Time) bool {
-	return DifferenceInMonth(t, origin) == 1
-}

tools/utils.go

@@ -1,9 +1,11 @@
 package tools
 
 import (
+	"database/sql"
 	"encoding/json"
 	"fmt"
 	"strings"
+	"time"
 
 	"github.com/mozillazg/go-pinyin"
 	"github.com/samber/lo"
@@ -144,3 +146,26 @@ func NullDecimalToString(d decimal.NullDecimal, precision ...int32) *string {
 	}
 	return lo.ToPtr(d.Decimal.StringFixedBank(precision[0]))
 }
+
+// 将sql.NullTime转换为*string
+func NullTime2PointerString(nullTime sql.NullTime) *string {
+	var strPtr *string
+	if nullTime.Valid {
+		str := nullTime.Time.String()
+		strPtr = &str
+		return strPtr
+	} else {
+		strPtr = nil
+		return strPtr
+	}
+}
+
+// 该方法用于将时间解析为字符串指针
+func TimeToStringPtr(t *time.Time) *string {
+	if t == nil {
+		return nil
+	}
+
+	timeStr := t.Format("2006-01-02 15:04:05")
+	return &timeStr
+}