as @PMario says, this is very old and you don't need skeeve's solution to accomplish this
this alone in a tiddler should already do what you want: \define phonecall-button-actions() <$action-setfield $tiddler="$(description)$ $(dateformat)$" $field="tags" $value="$(tag)$"/><$action-navigate $to="$(description)$ $(dateformat)$"/> \end <$vars tag="PhoneCall" description="Phone call today" dateformat=<<now "YYYY-0MM-0DD 0hh:0mm:0ss">>> <$button> <<phonecall-button-actions>>new phone call </$button> </$vars> -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/2a3d7887-5c90-424e-ad30-d0c059546dd3%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.

