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function onChange(control, oldValue, newValue, isLoading) {  
    if (isLoading || newValue == oldValue) {  
          return;  
    }  
  
    if (getDateFromFormat(newValue, 'dd-MM-yyyy HH:mm:ss') == 0) {  
          g_form.hideErrorBox('pstart_date');  
          g_form.showErrorBox('pstart_date', 'Date is invalid');  
    }  
    else {  
          g_form.hideErrorBox('pstart_date');  
    }  
}  

// client script
function onSubmit() {  
     if (getDateFromFormat(g_form.getValue('pstart_date'), 'dd-MM-yyyy HH:mm:ss') == 0) {  
          return false; // Prevents the form from submitting  
     }  
  
     if (getDateFromFormat(g_form.getValue('pend_date'), 'dd-MM-yyyy HH:mm:ss') == 0) {  
          return false; // Prevents the form from submitting  
     }  
  
     if (getDateFromFormat(g_form.getValue('other_field'), 'dd-MM-yyyy HH:mm:ss') == 0) {  
          return false; // Prevents the form from submitting  
     }  
}