How to send oracle to_date function in groovy sql.call.

Ok, I have done something below

import groovy.sql.Sql;
import groovy.sql.GroovyRowResult;

GroovyRowResult row = sql.firstRow("SELECT to_date('2021-04-28-00.00.00','YYYY-MM-DD-HH24.MI.SS','NLS_CALENDAR=GREGORIAN') AS MyDate FROM DUAL");
def MyDate= row.MyDate;

String RESULT = "";
sql.call( "{call MYAPP.MYDATE.UPDATE_DATE(?, ?)}", [ sql.inout(Sql.VARCHAR(RESULT), MyDate])

{OUT1 ->

RESULT = OUT1;

}