How can I add a button to load the current date-time to a field

I have a similar issue:  I have a text field "Events" which I use to log events.  Each event is just a text string:

DD/MM/YY text.

The events are listed LIFO (most recent first).

I would like to button to insert (append) the current date into the field.  From there I'll type the text.

I tried the above (correct vat to var) and nothing happens.  Here is what I have

var text URL = URLRoot() & "db/" & Dbid() & "?act=API_EditRecord" & "rid=" & [RecordID#] & "&_fid_44=" & URLEncode(Now());

"javascript:" &
"$.get('" & 
$URL & 
"',function(){" &
"location.reload(true);" &
"});" 
& "void(0);"

where 44 is the field ID of the Events field.  

Please advise.