code: func getDateTimePattern(datetimePattern, datePattern, timePattern string) string {
  	return strings.Replace(strings.Replace(datetimePattern, "{1}", datePattern, 1), "{0}", timePattern, 1)
  }
docs: // getDateTimePattern combines a date pattern and a time pattern into a datetime
  // pattern. The datetimePattern argument includes a {0} placeholder for the time
  // pattern, and a {1} placeholder for the date component.