formatting text in multilines fields

formatting text in multilines fields

I would like to add some test to a multiline field using Deluge on the
On Edit /  On success action.
Someting like input.LongText = input.LongText + "added on " + zoho.currentdate;

Say thay I want the date on a new line and in bold. How can I do this
? If I use escape characters for new line and carriage return
(

)
for some reason they are only executed the second time I load the form
(I have to reopen it and resubmit it)
and if I use tags for bold (<b>) they are executed in View but are
seen as such in the multiline field when I edit the form and I do not
want this.

Hope you can help