diff --git a/autoload/nuwiki/commands.vim b/autoload/nuwiki/commands.vim
index 7dccae3..8ef0141 100644
--- a/autoload/nuwiki/commands.vim
+++ b/autoload/nuwiki/commands.vim
@@ -419,32 +419,37 @@ endfunction
 
 " ===== Diary =====
 
-function! s:diary_open(cmd_name, ...) abort
-  let l:open = a:0 >= 1 ? a:1 : 'edit'
-  call s:exec(a:cmd_name, [{ 'uri': s:buf_uri() }],
-        \ {n -> s:open_uri_from(n, l:open)})
+" `a:open` is the window command ('edit'/'tabedit'); `a:count` is vimwiki's
+" diary `-count` — a wiki number (1-indexed at the user level). When > 0 the
+" server acts on that wiki instead of the buffer's.
+function! s:diary_open(cmd_name, open, count) abort
+  let l:arg = { 'uri': s:buf_uri() }
+  if a:count > 0
+    let l:arg['wiki'] = a:count - 1
+  endif
+  call s:exec(a:cmd_name, [l:arg], {n -> s:open_uri_from(n, a:open)})
 endfunction
 
-function! nuwiki#commands#diary_today() abort
-  call s:diary_open('nuwiki.diary.openToday')
+function! nuwiki#commands#diary_today(...) abort
+  call s:diary_open('nuwiki.diary.openToday', 'edit', a:0 >= 1 ? a:1 : 0)
 endfunction
-function! nuwiki#commands#diary_today_tab() abort
-  call s:diary_open('nuwiki.diary.openToday', 'tabedit')
+function! nuwiki#commands#diary_today_tab(...) abort
+  call s:diary_open('nuwiki.diary.openToday', 'tabedit', a:0 >= 1 ? a:1 : 0)
 endfunction
-function! nuwiki#commands#diary_yesterday() abort
-  call s:diary_open('nuwiki.diary.openYesterday')
+function! nuwiki#commands#diary_yesterday(...) abort
+  call s:diary_open('nuwiki.diary.openYesterday', 'edit', a:0 >= 1 ? a:1 : 0)
 endfunction
-function! nuwiki#commands#diary_tomorrow() abort
-  call s:diary_open('nuwiki.diary.openTomorrow')
+function! nuwiki#commands#diary_tomorrow(...) abort
+  call s:diary_open('nuwiki.diary.openTomorrow', 'edit', a:0 >= 1 ? a:1 : 0)
 endfunction
-function! nuwiki#commands#diary_index() abort
-  call s:diary_open('nuwiki.diary.openIndex')
+function! nuwiki#commands#diary_index(...) abort
+  call s:diary_open('nuwiki.diary.openIndex', 'edit', a:0 >= 1 ? a:1 : 0)
 endfunction
 function! nuwiki#commands#diary_next() abort
-  call s:diary_open('nuwiki.diary.next')
+  call s:diary_open('nuwiki.diary.next', 'edit', 0)
 endfunction
 function! nuwiki#commands#diary_prev() abort
-  call s:diary_open('nuwiki.diary.prev')
+  call s:diary_open('nuwiki.diary.prev', 'edit', 0)
 endfunction
 function! nuwiki#commands#diary_generate_index() abort
   call s:exec('nuwiki.diary.generateIndex', [{ 'uri': s:buf_uri() }])
diff --git a/crates/nuwiki-lsp/src/commands.rs b/crates/nuwiki-lsp/src/commands.rs
index d169cba..df8840f 100644
--- a/crates/nuwiki-lsp/src/commands.rs
+++ b/crates/nuwiki-lsp/src/commands.rs
@@ -308,6 +308,11 @@ fn parse_uri_arg(args: Vec<Value>) -> Result<UriArg, String> {
 struct OptionalUriArg {
     #[serde(default)]
     uri: Option<Url>,
+    /// Optional wiki selector (vimwiki's diary `-count`): the client sends a
+    /// 0-indexed wiki number when the user gave a count. When present it wins
+    /// over `uri`-based resolution (see `resolve_diary_wiki`).
+    #[serde(default)]
+    wiki: Option<Value>,
 }
 
 fn parse_optional_uri_arg(args: Vec<Value>) -> Result<OptionalUriArg, String> {
@@ -522,7 +527,7 @@ fn diary_list(backend: &Backend, args: Vec<Value>) -> Result<Option<Value>, Stri
         Some(v) => serde_json::from_value(v).map_err(|e| format!("invalid args: {e}"))?,
         None => Args::default(),
     };
-    let Some(wiki) = resolve_diary_wiki(backend, parsed.uri.as_ref()) else {
+    let Some(wiki) = resolve_diary_wiki(backend, parsed.uri.as_ref(), None) else {
         return Ok(Some(serde_json::json!([])));
     };
     let entries = {
@@ -556,7 +561,7 @@ fn diary_open_for_date(backend: &Backend, args: Vec<Value>) -> Result<Option<Val
             parsed.date
         ));
     };
-    let Some(wiki) = resolve_diary_wiki(backend, parsed.uri.as_ref()) else {
+    let Some(wiki) = resolve_diary_wiki(backend, parsed.uri.as_ref(), None) else {
         return Ok(None);
     };
     let Some(uri) = crate::diary::uri_for_date(&wiki.config, &date) else {
@@ -579,7 +584,7 @@ fn tags_search(backend: &Backend, args: Vec<Value>) -> Result<Option<Value>, Str
         Some(v) => serde_json::from_value(v).map_err(|e| format!("invalid args: {e}"))?,
         None => Args::default(),
     };
-    let Some(wiki) = resolve_diary_wiki(backend, parsed.uri.as_ref()) else {
+    let Some(wiki) = resolve_diary_wiki(backend, parsed.uri.as_ref(), None) else {
         return Ok(Some(serde_json::json!([])));
     };
     let hits = {
@@ -653,7 +658,7 @@ fn tags_rebuild(backend: &Backend, args: Vec<Value>) -> Result<Option<Value>, St
     let targets: Vec<crate::wiki::Wiki> = if all {
         backend.wikis_snapshot()
     } else {
-        match resolve_diary_wiki(backend, p.uri.as_ref()) {
+        match resolve_diary_wiki(backend, p.uri.as_ref(), None) {
             Some(w) => vec![w],
             None => return Ok(None),
         }
@@ -1171,7 +1176,7 @@ fn export_current(
 
 fn export_all(backend: &Backend, args: Vec<Value>, force: bool) -> Result<Option<Value>, String> {
     let p = parse_optional_uri_arg(args)?;
-    let Some(wiki) = resolve_diary_wiki(backend, p.uri.as_ref()) else {
+    let Some(wiki) = resolve_diary_wiki(backend, p.uri.as_ref(), None) else {
         return Ok(None);
     };
     let cfg = wiki.config.clone();
@@ -1248,7 +1253,7 @@ fn export_all(backend: &Backend, args: Vec<Value>, force: bool) -> Result<Option
 
 fn export_rss(backend: &Backend, args: Vec<Value>) -> Result<Option<Value>, String> {
     let p = parse_optional_uri_arg(args)?;
-    let Some(wiki) = resolve_diary_wiki(backend, p.uri.as_ref()) else {
+    let Some(wiki) = resolve_diary_wiki(backend, p.uri.as_ref(), None) else {
         return Ok(None);
     };
     let entries = {
diff --git a/development/tests/test-keymaps.lua b/development/tests/test-keymaps.lua
index 2835bec..bb2daff 100644
--- a/development/tests/test-keymaps.lua
+++ b/development/tests/test-keymaps.lua
@@ -915,6 +915,15 @@ vim.defer_fn(function()
       error('VimwikiMakeDiaryNote missing -count: ' .. vim.inspect(c))
     end
   end)
+  -- Diary-note family carries -count=0 (vimwiki's wiki selector), so
+  -- `:2VimwikiMakeDiaryNote` selects wiki #2 instead of raising E481.
+  tobj_case('cmd.VimwikiMakeDiaryNote_has_count', function()
+    local c = vim.api.nvim_buf_get_commands(0, {}).VimwikiMakeDiaryNote
+    if not c then error(':VimwikiMakeDiaryNote not defined') end
+    if c.count == nil or c.count == false then
+      error('VimwikiMakeDiaryNote missing -count: ' .. vim.inspect(c))
+    end
+  end)
   -- `:VimwikiNormalizeLink 1` (the arg is upstream's visual flag; the command
   -- is -nargs=? not -range, so no `'<,'>`) wraps the last visual selection.
   tobj_case('cmd.normalize_link_visual_wraps_selection', function()
diff --git a/development/vimwiki-gap.md b/development/vimwiki-gap.md
index d9fdf7b..45ebf03 100644
--- a/development/vimwiki-gap.md
+++ b/development/vimwiki-gap.md
@@ -304,8 +304,8 @@ fix site.
   same day)_ — upstream's `:Vimwiki{Make,TabMake,MakeYesterday,MakeTomorrow}DiaryNote`
   + `VimwikiDiaryIndex` (and the `Nuwiki*` forms) carry `-count=0`, where the
   count selects the wiki number. _Fix:_ a real wiki selector end-to-end —
-  - Server (`commands.rs`): `OptUriArg` gained an optional `wiki` selector and
-    `resolve_diary_wiki(backend, uri, wiki)` now prefers it (via the existing
+  - Server (`commands.rs`): `OptionalUriArg` gained an optional `wiki` selector
+    and `resolve_diary_wiki(backend, uri, wiki)` now prefers it (via the existing
     `resolve_wiki_selector`, reused — accepts a 0-indexed number) over the
     buffer URI; used by `diary_open_relative` + `diary_open_index`.
   - Clients: `s:diary_open`/`diary_open` (both clients) and
diff --git a/lua/nuwiki/commands.lua b/lua/nuwiki/commands.lua
index da33e61..e37a1e5 100644
--- a/lua/nuwiki/commands.lua
+++ b/lua/nuwiki/commands.lua
@@ -310,9 +310,16 @@ end
 
 -- ===== Diary =====
 
+-- `count` is vimwiki's diary `-count` — a wiki number (1-indexed at the user
+-- level). When > 0 the server acts on that wiki (`wiki = count - 1`) instead
+-- of the buffer's. next/prev ignore it.
 local function _diary_open(cmd_name, tab)
-  return function()
-    exec(cmd_name, uri_args(), function(r)
+  return function(count)
+    local args = uri_args()
+    if count and count > 0 then
+      args[1].wiki = count - 1
+    end
+    exec(cmd_name, args, function(r)
       if r and r.uri then open_uri(r.uri, tab) end
     end)
   end