My first script

Hi Guys,
I am trying to validate a date field.
The idea is to not allow a user to enter time in the past.
I have a custom field Training date.
See my script:

// If field "Training date" is not greater than today,  system alert the user.

function sampleFieldChanged(type, name);

{

if (name == 'custentity_test_training_test')

{

Var todays_date = new Date();
var todays_date_ms = todays_date.getTime()
var custentity_test_training_test = nlapiStringToDate('custentity_test_training_test').getTime();
         
if ((nlapiGetFieldValue('custentity_test_training_test') < date())


  {
  alert("Please review the Training date");
  return true;
  }

}
return true;
}
  I know that i am missing something but not sure what??