add

trading_assistant_api/common/logger/logger.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"fmt"
 	"path/filepath"
+	"time"
 )
 
 type Logger interface {
@@ -64,3 +65,15 @@ func SetupFile(path string) error {
 	}
 	return nil
 }
+
+func SetupTimezone(tz string) error {
+	if tz == "" {
+		return fmt.Errorf("timezone empty")
+	}
+	loc, err := time.LoadLocation(tz)
+	if err != nil {
+		return err
+	}
+	time.Local = loc
+	return nil
+}