diff --git a/src/app/views/upload.zig b/src/app/views/upload.zig
index 15deee3..0beaf95 100644
--- a/src/app/views/upload.zig
+++ b/src/app/views/upload.zig
@@ -15,7 +15,17 @@ pub fn index(request: *jetzig.Request, data: *jetzig.Data) !jetzig.View {
 pub fn post(request: *jetzig.Request) !jetzig.View {
     var root = try request.data(.object);
 
-    const params = try request.params();
+    //const params = try request.params();
+
+    const UploadParams = struct {
+        source: enum { LFMW, LFMS, Spotify },
+        earliest_date: ?[]const u8,
+        latest_date: ?[]const u8,
+        username: ?[]const u8,
+    };
+
+    const params = (try request.expectParams(UploadParams)).?;
+
     const rule_file = try (std.fs.cwd().openFile("rules.json", .{ .mode = .read_only }) catch |err| switch (err) {
         error.FileNotFound => std.fs.cwd().createFile("rules.json", .{ .read = true }),
         else => err,
@@ -26,43 +36,39 @@ pub fn post(request: *jetzig.Request) !jetzig.View {
     const rule_list = std.json.parseFromSliceLeaky([]Data.Rule, request.allocator, rule_file_content, .{}) catch null;
     //var job = try request.job("process_scrobbles");
     var job = try request.job("process_scrobbles2");
-    const source = params.getT(.integer, "t").?; // This param is required in HTML
 
-    const latest_date = if (params.getT(.boolean, "adv-opt")) |_| blk: {
-        const date = params.getT(.string, "latest-date").?;
-        break :blk try zeit.Time.fromISO8601(date);
-    } else (try zeit.instant(.{ .source = .now })).time();
+    // We can parse the dates better
+    const latest_ts = if (params.latest_date) |ld|
+        (try zeit.instant(.{ .source = .{ .iso8601 = ld } })).timestamp
+    else
+        (try zeit.instant(.{ .source = .now })).timestamp;
 
-    const earliest_date = if (params.getT(.boolean, "adv-opt")) |_| blk: {
-        const date = params.getT(.string, "earliest-date").?;
-        break :blk try zeit.Time.fromISO8601(date);
-    } else (try zeit.instant(.{ .source = .{ .unix_timestamp = 0 } })).time();
-
-    const earliest_timestamp = earliest_date.instant().unixTimestamp();
-    const latest_timestamp = latest_date.instant().unixTimestamp();
+    const earliest_ts = if (params.earliest_date) |ed|
+        (try zeit.instant(.{ .source = .{ .iso8601 = ed } })).timestamp
+    else
+        (try zeit.instant(.{ .source = .{ .unix_timestamp = 0 } })).timestamp;
 
     var view_params = try root.put("scrobbles", .array);
-    //var job_params = try job.params.put("scrobbles", .array);
 
     var skipped_tracks: u64 = 0;
     var limited_tracks: u64 = 0;
 
-    const imported_scrobbles: []Data.UnifiedScrobble = switch (source) {
-        0, 1 => try Utils.scrobbleIngest(request.allocator, if (try request.file("upload")) |file| file.content else unreachable),
-        2 => blk: {
+    const imported_scrobbles: []Data.UnifiedScrobble = switch (params.source) {
+        .LFMS, .Spotify => try Utils.scrobbleIngest(request.allocator, if (try request.file("upload")) |file| file.content else unreachable),
+        .LFMW => blk: {
             const user_agent: []const u8 = "Zuletzt/0.0.1";
             var client = Client{ .allocator = request.allocator };
             var lastfm_response_buffer = std.ArrayList(u8).init(request.allocator);
             var scrobble_buffer = std.ArrayList(Data.UnifiedScrobble).init(request.allocator);
 
-            const username = if (params.getT(.string, "username")) |un| un else "VAOTM";
+            const username = if (params.username) |un| un else "VAOTM";
 
             var page: usize = 1;
             //var max_pages: ?usize = null;
 
             while (true) : (page += 1) {
                 if (page > 91) break;
-                const query: []const u8 = try std.fmt.allocPrint(request.allocator, "https://ws.audioscrobbler.com/2.0/?method=user.getrecenttracks&user={s}&api_key=b0c410a48a6078a651e0832699e3cd41&from={}&to={}&page={}&limit=1000&format=json", .{ username, earliest_timestamp, latest_timestamp, page });
+                const query: []const u8 = try std.fmt.allocPrint(request.allocator, "https://ws.audioscrobbler.com/2.0/?method=user.getrecenttracks&user={s}&api_key=b0c410a48a6078a651e0832699e3cd41&from={}&to={}&page={}&limit=1000&format=json", .{ username, @divFloor(earliest_ts, std.time.ns_per_s), @divFloor(latest_ts, std.time.ns_per_s), page });
                 const r = try client.fetch(.{ .response_storage = .{ .dynamic = &lastfm_response_buffer }, .location = .{ .url = query }, .method = .GET, .headers = .{ .user_agent = .{ .override = user_agent } } });
                 std.log.debug("{}: {}", .{ page, r });
                 if (@intFromEnum(r.status) == 500) {
@@ -79,7 +85,6 @@ pub fn post(request: *jetzig.Request) !jetzig.View {
 
             break :blk try scrobble_buffer.toOwnedSlice();
         },
-        else => unreachable,
     };
 
     var artists = try job.params.put("artists", .object);
@@ -89,8 +94,10 @@ pub fn post(request: *jetzig.Request) !jetzig.View {
     var albumsongs = try job.params.put("albumsongs", .object);
     var albumsongsartists = try job.params.put("albumsongsartists", .object);
 
+    var hash_buffer = [_]u8{undefined} ** 20; // A minimum i64 needs 19 digits + 1 negative sign
+
     appends: for (imported_scrobbles) |scrobble| {
-        if (scrobble.date > latest_timestamp * std.time.ns_per_s or scrobble.date < earliest_timestamp * std.time.ns_per_s) {
+        if (scrobble.date > latest_ts or scrobble.date < earliest_ts) {
             limited_tracks += 1;
             continue :appends;
         }
@@ -124,18 +131,20 @@ pub fn post(request: *jetzig.Request) !jetzig.View {
             try album_hash_string.appendSlice(artist);
             const artist_hash = std.hash.Fnv1a_64.hash(artist);
             try stored_artist_hashes.append(artist_hash);
-            const signed_hash_string = try std.fmt.allocPrint(request.allocator, "{}", .{@as(i64, @bitCast(artist_hash))});
+            //const signed_hash_string = try std.fmt.allocPrint(request.allocator, "{}", .{@as(i64, @bitCast(artist_hash))});
+            const signed_hash_string = try std.fmt.bufPrint(&hash_buffer, "{}", .{@as(i64, @bitCast(artist_hash))});
             if (artists.get(signed_hash_string) == null) try artists.put(signed_hash_string, artist);
         }
 
         try album_hash_string.appendSlice(complete_scrobble.album);
         const album_hash = std.hash.Fnv1a_64.hash(album_hash_string.items);
-        const signed_album_hash_string = try std.fmt.allocPrint(request.allocator, "{}", .{@as(i64, @bitCast(album_hash))});
+        const signed_album_hash_string = try std.fmt.bufPrint(&hash_buffer, "{}", .{@as(i64, @bitCast(album_hash))});
         if (albums.get(signed_album_hash_string) == null) try albums.put(signed_album_hash_string, complete_scrobble.album);
 
         for (stored_artist_hashes.items) |artist_hash| {
             const artistalbum_hash = pair(artist_hash, album_hash);
-            const signed_artistalbums_hash_string = try std.fmt.allocPrint(request.allocator, "{}", .{@as(i64, @bitCast(artistalbum_hash))});
+            //const signed_artistalbums_hash_string = try std.fmt.allocPrint(request.allocator, "{}", .{@as(i64, @bitCast(artistalbum_hash))});
+            const signed_artistalbums_hash_string = try std.fmt.bufPrint(&hash_buffer, "{}", .{@as(i64, @bitCast(artistalbum_hash))});
             if (tracks.get(signed_artistalbums_hash_string) == null) {
                 var artistalbum = try artistalbums.put(signed_artistalbums_hash_string, .object);
                 try artistalbum.put("artist", @as(i64, @bitCast(artist_hash)));
@@ -147,28 +156,28 @@ pub fn post(request: *jetzig.Request) !jetzig.View {
         try track_hash_string.appendSlice(complete_scrobble.album);
         try track_hash_string.appendSlice(complete_scrobble.track);
         const track_hash = std.hash.Fnv1a_64.hash(track_hash_string.items);
-        const signed_track_hash_string = try std.fmt.allocPrint(request.allocator, "{}", .{@as(i64, @bitCast(track_hash))});
+        const signed_track_hash_string = try std.fmt.bufPrint(&hash_buffer, "{}", .{@as(i64, @bitCast(track_hash))});
         if (tracks.get(signed_track_hash_string) == null) try tracks.put(signed_track_hash_string, complete_scrobble.track);
 
         const albumsong_hash = pair(album_hash, track_hash);
-        const signed_albumsong_hash_string = try std.fmt.allocPrint(request.allocator, "{}", .{@as(i64, @bitCast(albumsong_hash))});
+        const signed_albumsong_hash_string = try std.fmt.bufPrint(&hash_buffer, "{}", .{@as(i64, @bitCast(albumsong_hash))});
         if (albumsongs.get(signed_albumsong_hash_string)) |albumsong| {
             var albumsong_scrobbles = albumsong.get("scrobbles");
-            try albumsong_scrobbles.?.append(complete_scrobble.date);
+            try albumsong_scrobbles.?.append(@divFloor(complete_scrobble.date, std.time.ns_per_us)); // MICROSECONDS
         } else {
             var albumsong = try albumsongs.put(signed_albumsong_hash_string, .object);
             try albumsong.put("album", @as(i64, @bitCast(album_hash)));
             try albumsong.put("song", @as(i64, @bitCast(track_hash)));
             var albumsong_scrobbles = try albumsong.put("scrobbles", .array);
-            try albumsong_scrobbles.append(complete_scrobble.date);
+            try albumsong_scrobbles.append(@divFloor(complete_scrobble.date, std.time.ns_per_us)); // MICROSECONDS
         }
 
         for (complete_scrobble.artists_track) |artist| {
             const artist_hash = std.hash.Fnv1a_64.hash(artist);
-            const signed_artist_hash_string = try std.fmt.allocPrint(request.allocator, "{}", .{@as(i64, @bitCast(artist_hash))});
+            const signed_artist_hash_string = try std.fmt.bufPrint(&hash_buffer, "{}", .{@as(i64, @bitCast(artist_hash))});
             if (artists.get(signed_artist_hash_string) == null) try artists.put(signed_artist_hash_string, artist);
             const albumsongsartist_hash = pair(albumsong_hash, artist_hash);
-            const signed_albumsongsartist_hash_string = try std.fmt.allocPrint(request.allocator, "{}", .{albumsongsartist_hash});
+            const signed_albumsongsartist_hash_string = try std.fmt.bufPrint(&hash_buffer, "{}", .{@as(i64, @bitCast(albumsongsartist_hash))});
             if (albumsongsartists.get(signed_albumsongsartist_hash_string) == null) {
                 var albumsongartist = try albumsongsartists.put(signed_albumsongsartist_hash_string, .object);
                 try albumsongartist.put("albumsong", @as(i64, @bitCast(albumsong_hash)));
@@ -177,12 +186,14 @@ pub fn post(request: *jetzig.Request) !jetzig.View {
         }
     }
 
-    std.log.debug("\nSkipped {} tracks\nFiltered {} tracks by date", .{ skipped_tracks, limited_tracks });
+    std.log.debug("Skipped {} tracks\nFiltered {} tracks by date", .{ skipped_tracks, limited_tracks });
     try job.schedule();
 
     return request.render(.created);
 }
 
+// Cantor Pairing Function
+// https://en.wikipedia.org/wiki/Pairing_function
 fn pair(a: u64, b: u64) u64 {
-    return @divFloor((a +% b) *% (a +% b +% 1) +% b, 2);
+    return @mod(@divFloor((a +% b) *% (a +% b +% 1), 2) +% b, std.math.maxInt(u64));
 }
diff --git a/src/app/views/upload/index.zmpl b/src/app/views/upload/index.zmpl
index 420e08c..bdeaacb 100644
--- a/src/app/views/upload/index.zmpl
+++ b/src/app/views/upload/index.zmpl
@@ -14,14 +14,29 @@
   <label>Username</label>
   <input type="text" name="username"/>
   <fieldset>
-  <input type="radio" name="t" label="Last.fm" value="0" required>Last.fm</input>
-  <input type="radio" name="t" label="Spotify" value="1" required>Spotify</input>
-  <input type="radio" name="t" label="Last.fm (Web Auth)" value="2" required>Last.fm (WebAuth)</input>
+  <input type="radio" name="source" label="Last.fm" value="LFMS" required>Last.fm</input>
+  <input type="radio" name="source" label="Spotify" value="Spotify" required>Spotify</input>
+  <input type="radio" name="source" label="Last.fm (Web Auth)" value="LFMW" required>Last.fm (WebAuth)</input>
   
-  <input type="checkbox" name="adv-opt" label="Advanced Options">Advanced Options</input>
-  Limit to Scrobbles before: <input type="datetime-local" name="latest-date" label="date-before"></input>
-  Limit to Scrobbles after: <input type="datetime-local" name="earliest-date" label="date-after"></input>
+  <input type="checkbox" id='adv-opt' name="adv-opt" label="Advanced Options">Advanced Options</input>
+  <div id="adv-opt-div" style="display: none;">
+  Limit to Scrobbles before: <input type="datetime-local" name="latest_date" label="date-before"></input>
+  Limit to Scrobbles after: <input type="datetime-local" name="earliest_date" label="date-after"></input>
+  </div>
   </fieldset>
 </form>
 </body>
 </html>
+
+<script>
+  const check = document.getElementById('adv-opt');
+  const box = document.getElementById('adv-opt-div')
+
+  check.addEventListener('click', function handleClick() {
+  if (check.checked) {
+    box.style.display = 'block'; // Element is shown
+  } else {
+    box.style.display = 'none';  // Element is hidden
+  }
+});
+</script>
diff --git a/src/date_fmt.zig b/src/date_fmt.zig
index 5a883b4..e6914a4 100644
--- a/src/date_fmt.zig
+++ b/src/date_fmt.zig
@@ -64,7 +64,7 @@ const ScrobbleFields = enum {
     ms_played, // Spotify playtime
     reason_end, // Spotify reason end,1_000
     @"@attr", // LastFM now playing
-    irrelevant,
+    irrelevant, // Not a field I care about
 };
 
 pub fn scrobbleIngest(allocator: std.mem.Allocator, input: []const u8) ![]Data.UnifiedScrobble {