[CBRD-25239] user variable time format (#5001)

http://jira.cubrid.org/browse/CBRD-25239

* Fixed error when using User variable in TIME_FORMAT() function

src/query/string_opfunc.c

@@ -12323,21 +12323,29 @@ db_time_format (const DB_VALUE * src_value, const DB_VALUE * format, const DB_VA
     case DB_TYPE_NCHAR:
       {
 	DB_VALUE tm;
+	TZ_ID tz_id;
 	TP_DOMAIN *tp_time = db_type_to_db_domain (DB_TYPE_TIME);
-	bool is_time = false;
 
-	if (tp_value_cast (time_value, &tm, tp_time, false) == DOMAIN_COMPATIBLE)
+	if (tp_value_cast (time_value, &tm, tp_time, false) != DOMAIN_COMPATIBLE)
 	  {
-	    db_time_decode (db_get_time (&tm), &h, &mi, &s);
-	    is_time = true;
+	    error_status = ER_QSTR_INVALID_DATA_TYPE;
+	    er_set (ER_ERROR_SEVERITY, ARG_FILE_LINE, error_status, 0);
+	    goto error;
 	  }
 
-	if (is_time == false)
+	db_time_decode (db_get_time (&tm), &h, &mi, &s);
+
+	error_status = tz_create_session_tzid_for_time (db_get_time (&tm), true, &tz_id);
+	if (error_status != NO_ERROR)
 	  {
-	    error_status = ER_QSTR_INVALID_DATA_TYPE;
-	    er_set (ER_ERROR_SEVERITY, ARG_FILE_LINE, error_status, 0);
 	    goto error;
 	  }
+	error_status = tz_explain_tz_id (&tz_id, tzr, TZR_SIZE + 1, tzd, TZ_DS_STRING_SIZE + 1, &tzh, &tzm);
+	if (error_status != NO_ERROR)
+	  {
+	    goto error;
+	  }
+	is_valid_tz = true;
       }
       break;