implement bop for expedition must recheck and qty in staff purchase need info

internal/utils/time.go

@@ -1,8 +1,9 @@
 package utils
 
 import (
-	"time"
 	"errors"
+	"strings"
+	"time"
 )
 
 // ParseDateString mengubah string "YYYY-MM-DD" menjadi time.Time
@@ -23,3 +24,35 @@ func ParseDateString(dateStr string) (time.Time, error) {
 func FormatDate(t time.Time) string {
 	return t.Format("2006-01-02")
 }
+
+// ParseDateRangeForQuery parses optional YYYY-MM-DD from/to strings for list filters.
+// It returns a start pointer (inclusive) and an end pointer advanced by one day
+// so callers can safely use "< end" to achieve an inclusive upper bound.
+func ParseDateRangeForQuery(fromStr, toStr string) (*time.Time, *time.Time, error) {
+	var fromPtr *time.Time
+	var toPtr *time.Time
+
+	if strings.TrimSpace(fromStr) != "" {
+		parsed, err := ParseDateString(strings.TrimSpace(fromStr))
+		if err != nil {
+			return nil, nil, errors.New("created_from must use format YYYY-MM-DD")
+		}
+		fromValue := parsed
+		fromPtr = &fromValue
+	}
+
+	if strings.TrimSpace(toStr) != "" {
+		parsed, err := ParseDateString(strings.TrimSpace(toStr))
+		if err != nil {
+			return nil, nil, errors.New("created_to must use format YYYY-MM-DD")
+		}
+		nextDay := parsed.AddDate(0, 0, 1)
+		toPtr = &nextDay
+	}
+
+	if fromPtr != nil && toPtr != nil && fromPtr.After(*toPtr) {
+		return nil, nil, errors.New("created_from must be earlier than created_to")
+	}
+
+	return fromPtr, toPtr, nil
+}