Something like...
Ah, here's your transclusion assuming you want the last 60 days...
<<tiddler ListaTB14Email##out with: {{
var now = new Date(),
out=['!!!Email TB14\n|sortable|k\n|Datum|Mail|h'];
field = 'fdatum',
tag = 'kundkort';
store.sortTiddlers(
store.getTaggedTiddlers(tag),
field
).map(function(t){
var d = new Date(store.getValue(t,field));
if((now - d) < 2*30*24*60*60*1000)
out.push(
"|%0|%1,%2|".format([
d.formatString('YYYY-0MM-0DD'),
store.getValue(t,"email"),
store.getValue(t,"email2")
])
);
});
out.join('\n');
}}>>