How do you set current timestamp to field of HL7 result in Mirth?

var ctimestamp = DateUtil.getCurrentDate('yyyyMMddhhmmss');

msg['MSH']['MSH.7']['MSH.7.1'] = ctimestamp;
msg['MSH']['MSH.10']['MSH.10.1'] = ctimestamp;

Formatting options :
- yyyy year (four-digit)
- M, MM month, month with leading 0
- d, dd day, day with leading 0
- HH hour, 24-hour-format
- hh hour, 12-hour-format
- mm minutes
- ss seconds
- SSS milliseconds
- ww week in year