Update layout

.env.example

@@ -0,0 +1,2 @@
+PORT=3000
+CALURL=https://calendar.google.com/calendar/ical/xxxxx/basic.ics

CLAUDE.md

@@ -66,7 +66,7 @@ one runtime dependency (`node-ical`).
 - **`tags.json`** — user-editable, not code. Maps an emoji to
   `{ label, color }`. `color` must be one of the names in `TAG_COLOR_VAR` in
   `index.html` (`blue`, `aqua`, `yellow`, `green`, `violet`, `red`,
-  `magenta`, `orange`, `gray`, `purple`, `lightblue`) — an unrecognized
+  `magenta`, `orange`, `gray`, `purple`, `lightblue`, `white`) — an unrecognized
   color name silently falls back to blue rather than erroring, so a typo
   here won't crash anything but will look wrong.
 - **`.env`** (gitignored) — optional `CALURL=<ics url>`, used only to

README.md

@@ -0,0 +1,57 @@
+# CalendarOverview
+
+Paste a Google Calendar ICS URL, see a two-year (current + next) overview.
+Each day is split into three segments — morning (00:00–12:00), afternoon
+(12:00–18:00), evening (18:00–24:00) — that light up based on your events.
+
+## Running it
+
+```
+npm install
+npm start          # http://localhost:3000
+./start.sh          # same, on port 4000
+```
+
+Optionally set `CALURL=<your ics url>` in a `.env` file (copy
+`.env.example`) to have the URL prefilled on load. It's only used to prefill
+the input server-side and is never logged.
+
+## Tagging events with emoji
+
+Start an event title with an emoji to color its segment. Emoji-to-color
+mappings live in `tags.json`:
+
+```json
+{ "💜": { "label": "Tessa", "color": "magenta" } }
+```
+
+- One leading emoji not in `tags.json` still lights up (in a fallback
+  color) so it stands out from plain events.
+- Two leading emoji (with or without a space between them, e.g. `✈️💜` or
+  `✈️ 💜`) split the segment into both colors.
+- Events without a leading emoji still light their segment, just muted/grey.
+- All-day events light all three segments for every day they span.
+
+## Conflicts
+
+If two tagged events overlap in time on the same day, that day is flagged
+as a conflict. Add the standalone word `nc` anywhere in the title (e.g.
+"Videobellen Caroline & Bas nc") to mark that event as intentionally
+overlapping — it's excluded from conflict detection but still shows and
+still gets colored normally.
+
+## Timezones
+
+All event times are displayed in Amsterdam local time, regardless of the
+timezone the source event was created in (UTC, another IANA zone, etc.).
+Events with no timezone info at all (a "floating" time per the ICS spec)
+are shown as-is, unconverted.
+
+## Tests
+
+```
+npm test
+```
+
+Plain `assert`-based script (`test_days.js`) covering recurrence expansion,
+segment lighting, emoji tagging, and conflict detection.

days.js

@@ -36,9 +36,11 @@ function addDays(dateStr, n) {
 function localParts(date, tz) {
   // ponytail: no TZID means "floating" time per RFC 5545 - interpret in the
   // system's local zone (matches how node-ical encodes floating DATE values),
-  // not UTC.
+  // not UTC. A real tz (incl. "Etc/UTC" for Z-suffixed timestamps) is an
+  // absolute instant - always display it in Amsterdam, not whatever zone
+  // the source event happened to carry.
   const fmt = new Intl.DateTimeFormat('en-CA', {
-    ...(tz ? { timeZone: tz } : {}),
+    ...(tz ? { timeZone: 'Europe/Amsterdam' } : {}),
     year: 'numeric', month: '2-digit', day: '2-digit',
     hour: '2-digit', minute: '2-digit', hour12: false,
   });
@@ -58,9 +60,9 @@ function formatHour(hour) {
 }
 
 function segmentsForDay(dayStr, startLocal, lastDayStr, endLocal, isFullDay) {
-  if (isFullDay) return [0, 1, 2];
+  const dayStartHour = isFullDay ? 0 : (dayStr === startLocal.dateStr ? startLocal.hour : 0);
-  const dayStartHour = dayStr === startLocal.dateStr ? startLocal.hour : 0;
+  const dayEndHour = isFullDay ? 24 : (dayStr === lastDayStr ? endLocal.hour : 24);
-  const dayEndHour = dayStr === lastDayStr ? endLocal.hour : 24;
+  if (isFullDay) return { lit: [0, 1, 2], start: dayStartHour, end: dayEndHour };
   const lit = [];
   SEGMENT_RANGES.forEach(([segStart, segEnd], i) => {
     if (dayStartHour < segEnd && dayEndHour > segStart) lit.push(i);
@@ -69,7 +71,17 @@ function segmentsForDay(dayStr, startLocal, lastDayStr, endLocal, isFullDay) {
     const idx = SEGMENT_RANGES.findIndex(([, segEnd]) => dayStartHour < segEnd);
     lit.push(idx === -1 ? 2 : idx);
   }
-  return lit;
+  return { lit, start: dayStartHour, end: dayEndHour };
+}
+
+// two tagged events sharing a day overlap if their local-hour spans intersect
+function hasOverlap(intervals) {
+  for (let i = 0; i < intervals.length; i++) {
+    for (let j = i + 1; j < intervals.length; j++) {
+      if (intervals[i].start < intervals[j].end && intervals[j].start < intervals[i].end) return true;
+    }
+  }
+  return false;
 }
 
 function buildOverview(icsText, tagsConfig, rangeStartStr, rangeEndStr) {
@@ -79,7 +91,7 @@ function buildOverview(icsText, tagsConfig, rangeStartStr, rangeEndStr) {
   const days = {};
 
   const getDay = (dateStr) => {
-    if (!days[dateStr]) days[dateStr] = { segments: [null, null, null], events: [] };
+    if (!days[dateStr]) days[dateStr] = { segments: [null, null, null], events: [], taggedIntervals: [] };
     return days[dateStr];
   };
 
@@ -99,6 +111,8 @@ function buildOverview(icsText, tagsConfig, rangeStartStr, rangeEndStr) {
       const summary = inst.summary || '(untitled)';
       const colors = leadingEmojis(summary).map((e) => (tagsConfig[e] ? tagsConfig[e].color : UNKNOWN_EMOJI_COLOR));
       const color = colors.length === 2 ? colors : colors[0] || null;
+      // "nc" as a standalone word anywhere in the title marks a conflict as resolved
+      const noConflict = /\bnc\b/i.test(summary);
 
       const startLocal = localParts(inst.start, inst.start.tz);
       const endInstant = isFullDay
@@ -111,11 +125,12 @@ function buildOverview(icsText, tagsConfig, rangeStartStr, rangeEndStr) {
       while (true) {
         if (dayStr >= rangeStartStr && dayStr <= rangeEndStr) {
           const day = getDay(dayStr);
-          const lit = segmentsForDay(dayStr, startLocal, lastDayStr, endLocal, isFullDay);
+          const { lit, start, end } = segmentsForDay(dayStr, startLocal, lastDayStr, endLocal, isFullDay);
           for (const segIdx of lit) {
             if (color) day.segments[segIdx] = color;
             else if (!day.segments[segIdx]) day.segments[segIdx] = 'muted';
           }
+          if (color && !noConflict) day.taggedIntervals.push({ start, end });
           day.events.push({
             hour: dayStr === startLocal.dateStr ? startLocal.hour : 0,
             isFullDay,
@@ -133,7 +148,7 @@ function buildOverview(icsText, tagsConfig, rangeStartStr, rangeEndStr) {
     const lines = day.events
       .sort((a, b) => a.hour - b.hour)
       .map((e) => `${e.isFullDay ? 'All day' : formatHour(e.hour)} ${e.text}`);
-    result[dateStr] = { segments: day.segments, tooltip: lines.join('\n') };
+    result[dateStr] = { segments: day.segments, tooltip: lines.join('\n'), conflict: hasOverlap(day.taggedIntervals) };
   }
   return result;
 }

package.json

@@ -4,6 +4,7 @@
   "description": "",
   "main": "server.js",
   "scripts": {
+    "prestart": "test -d node_modules || npm install",
     "start": "node --env-file-if-exists=.env server.js",
     "test": "node test_days.js"
   },

public/index.html

@@ -22,6 +22,7 @@
     --orange: #eb6834;
     --gray: #6e6c66;
     --lightblue: #3fa9dc;
+    --white: #ffffff;
   }
   @media (prefers-color-scheme: dark) {
     :root {
@@ -96,14 +97,6 @@
     color: var(--ink-2);
     font-size: 12px;
   }
-  .legend .swatch {
-    display: inline-block;
-    width: 10px;
-    height: 10px;
-    border-radius: 2px;
-    margin-right: 5px;
-    vertical-align: middle;
-  }
   .legend .item { display: inline-flex; align-items: center; }
 
   .year-grid {
@@ -117,10 +110,16 @@
     border-radius: 8px;
     padding: 8px;
   }
-  .month h3 {
+  .month-head {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    margin-bottom: 6px;
+  }
+  .month-head h3 {
     font-size: 12px;
     font-weight: 600;
-    margin: 0 0 6px;
+    margin: 0;
     color: var(--ink-2);
   }
   .weekdays, .days {
@@ -143,6 +142,7 @@
     border-radius: 3px;
   }
   .day.today { outline: 1.5px solid var(--today); outline-offset: -1.5px; }
+  .day.conflict { box-shadow: inset 0 0 0 1.5px var(--red); }
   .day .num { font-size: 8px; color: var(--ink-muted); line-height: 1; }
   .day.blank .num { visibility: hidden; }
   .segs { display: flex; gap: 1px; }
@@ -153,6 +153,54 @@
     background: transparent;
   }
   .seg.muted { background: var(--ink-muted); opacity: 0.35; }
+
+  .month.past { position: relative; }
+  .month.past::after {
+    content: '';
+    position: absolute;
+    inset: 0;
+    background: rgba(0, 0, 0, 0.35);
+    border-radius: 8px;
+    pointer-events: none;
+  }
+
+  .swatch {
+    display: inline-block;
+    width: 10px;
+    height: 10px;
+    border-radius: 2px;
+    margin-right: 5px;
+    vertical-align: middle;
+  }
+
+  .cat-block { display: flex; align-items: center; gap: 10px; }
+  .pie { border-radius: 50%; flex: none; }
+  .pie-empty { background: var(--gridline); }
+  .cat-list { list-style: none; margin: 0; padding: 0; font-size: 12px; color: var(--ink-2); }
+  .cat-list li { display: flex; align-items: center; margin-bottom: 2px; }
+  .cat-empty { font-size: 12px; color: var(--ink-muted); }
+
+  .pie-trigger { position: relative; }
+  .pie-trigger > .pie { border: 1px solid var(--border); }
+  .pie-popover {
+    display: none;
+    position: absolute;
+    top: 18px;
+    right: 0;
+    z-index: 10;
+    background: var(--surface);
+    border: 1px solid var(--border);
+    border-radius: 8px;
+    padding: 16px;
+    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
+  }
+  .pie-trigger:hover .pie-popover { display: block; }
+  .pie-popover .cat-block { gap: 16px; }
+  .pie-popover .cat-list { font-size: 14px; white-space: nowrap; }
+  .pie-popover .swatch { width: 12px; height: 12px; }
+
+  .year-totals { display: flex; gap: 28px; flex-wrap: wrap; }
+  .year-total h4 { font-size: 12px; margin: 0 0 6px; color: var(--ink-2); font-weight: 600; }
 </style>
 
 <h1>Year Overview</h1>
@@ -163,6 +211,7 @@
 <div id="status"></div>
 <div id="legend" class="legend"></div>
 <div id="years"></div>
+<div id="report"></div>
 
 <script>
   const MONTH_NAMES = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'];
@@ -170,13 +219,14 @@
   const TAG_COLOR_VAR = {
     blue: '--blue', aqua: '--aqua', yellow: '--yellow', green: '--green',
     violet: '--violet', red: '--red', magenta: '--magenta', orange: '--orange',
-    gray: '--gray', purple: '--violet', lightblue: '--lightblue',
+    gray: '--gray', purple: '--violet', lightblue: '--lightblue', free: '--gridline', white: '--white',
   };
 
   const urlInput = document.getElementById('url');
   const statusEl = document.getElementById('status');
   const yearsEl = document.getElementById('years');
   const legendEl = document.getElementById('legend');
+  const reportEl = document.getElementById('report');
 
   urlInput.value = localStorage.getItem('icsUrl') || '';
 
@@ -194,7 +244,7 @@
     legendEl.innerHTML = items.join('');
   }
 
-  function renderMonth(year, month, days, today) {
+  function renderMonth(year, month, days, today, monthCounts, colorLabels) {
     const first = new Date(year, month, 1);
     const startWeekday = (first.getDay() + 6) % 7; // getDay() is Sunday-first; shift to Monday-first
     const numDays = new Date(year, month + 1, 0).getDate();
@@ -215,25 +265,115 @@
         }
         return `<span class="seg" style="background:var(${TAG_COLOR_VAR[s] || '--blue'})"></span>`;
       }).join('');
-      cells += `<div class="day${dateStr === today ? ' today' : ''}" title="${title}">
+      const cls = `day${dateStr === today ? ' today' : ''}${info && info.conflict && dateStr >= today ? ' conflict' : ''}`;
+      cells += `<div class="${cls}" title="${title}">
         <span class="num">${d}</span>
         <span class="segs">${segHtml}</span>
       </div>`;
     }
 
-    return `<div class="month">
+    const isPast = `${year}-${String(month + 1).padStart(2, '0')}` < today.slice(0, 7);
+    const entries = sortedEntries(monthCounts, colorLabels);
+    const iconHtml = buildPieHtml(entries, colorLabels, 14);
+    const popoverHtml = renderCategoryBlock(monthCounts, colorLabels, 130);
+    return `<div class="month${isPast ? ' past' : ''}">
+      <div class="month-head">
         <h3>${MONTH_NAMES[month]}</h3>
+        <div class="pie-trigger">
+          ${iconHtml}
+          <div class="pie-popover">${popoverHtml}</div>
+        </div>
+      </div>
       <div class="weekdays">${WEEKDAY_NAMES.map((w) => `<div>${w}</div>`).join('')}</div>
       <div class="days">${cells}</div>
     </div>`;
   }
 
-  function renderYear(year, days, today) {
+  function renderYear(year, days, today, monthTotals, colorLabels) {
     let months = '';
-    for (let m = 0; m < 12; m++) months += renderMonth(year, m, days, today);
+    for (let m = 0; m < 12; m++) months += renderMonth(year, m, days, today, monthTotals[m], colorLabels);
     return `<h2>${year}</h2><div class="year-grid">${months}</div>`;
   }
 
+  function buildColorLabels(tagsConfig) {
+    const map = { free: 'Free' };
+    for (const t of Object.values(tagsConfig)) map[t.color] = t.label;
+    return map;
+  }
+
+  // a color string adds 1 block; a split segment (2-color array) counts only the 2nd emoji;
+  // an empty segment adds 1 to 'free'
+  function yearCategoryTotals(year, days) {
+    const total = {};
+    const months = Array.from({ length: 12 }, () => ({}));
+    const add = (bucket, color, amt) => { bucket[color] = (bucket[color] || 0) + amt; };
+    for (let m = 0; m < 12; m++) {
+      const numDays = new Date(year, m + 1, 0).getDate();
+      for (let d = 1; d <= numDays; d++) {
+        const dateStr = `${year}-${String(m + 1).padStart(2, '0')}-${String(d).padStart(2, '0')}`;
+        const segments = days[dateStr] ? days[dateStr].segments : [null, null, null];
+        for (const seg of segments) {
+          if (seg === 'muted') continue;
+          const color = seg ? (Array.isArray(seg) ? seg[1] : seg) : 'free';
+          add(total, color, 1); add(months[m], color, 1);
+        }
+      }
+    }
+    return { total, months };
+  }
+
+  // entries pre-sorted by tag name, shared by pie wedges, tooltip and list so all three line up
+  function conicGradient(entries) {
+    const total = entries.reduce((s, [, n]) => s + n, 0);
+    if (total === 0) return null;
+    let acc = 0;
+    const stops = entries.map(([color, n]) => {
+      const from = (acc / total) * 360;
+      acc += n;
+      return `var(${TAG_COLOR_VAR[color] || '--blue'}) ${from}deg ${(acc / total) * 360}deg`;
+    });
+    return `conic-gradient(${stops.join(', ')})`;
+  }
+
+  function pieTitle(entries, colorLabels) {
+    return entries.map(([color, n]) => `${colorLabels[color] || color}: ${n}`).join('\n');
+  }
+
+  // pin Free last and Work second-last, everything else alphabetical by label
+  const LABEL_SORT_RANK = { Work: 1, Free: 2 };
+  function labelSortKey(label) { return [LABEL_SORT_RANK[label] || 0, label]; }
+
+  function sortedEntries(counts, colorLabels) {
+    return Object.entries(counts).filter(([, n]) => n > 0)
+      .sort((a, b) => {
+        const [ra, la] = labelSortKey(colorLabels[a[0]] || a[0]);
+        const [rb, lb] = labelSortKey(colorLabels[b[0]] || b[0]);
+        return ra - rb || la.localeCompare(lb);
+      });
+  }
+
+  function buildPieHtml(entries, colorLabels, size) {
+    const bg = conicGradient(entries);
+    return bg
+      ? `<div class="pie" style="width:${size}px;height:${size}px;background:${bg}" title="${pieTitle(entries, colorLabels).replace(/"/g, '&quot;')}"></div>`
+      : `<div class="pie pie-empty" style="width:${size}px;height:${size}px"></div>`;
+  }
+
+  function renderCategoryBlock(counts, colorLabels, size) {
+    const entries = sortedEntries(counts, colorLabels);
+    const pieHtml = buildPieHtml(entries, colorLabels, size);
+    const listHtml = entries.length
+      ? `<ul class="cat-list">${entries.map(([c, n]) =>
+          `<li><span class="swatch" style="background:var(${TAG_COLOR_VAR[c] || '--blue'})"></span>${colorLabels[c] || c}: ${n}</li>`
+        ).join('')}</ul>`
+      : `<div class="cat-empty">No events</div>`;
+    return `<div class="cat-block">${pieHtml}${listHtml}</div>`;
+  }
+
+  function renderYearTotal(year, total, colorLabels) {
+    return `<div class="year-total"><h4>${year}</h4>${renderCategoryBlock(total, colorLabels, 90)}</div>`;
+  }
+
   async function load() {
     const url = urlInput.value.trim();
     if (!url) return;
@@ -242,6 +382,7 @@
     statusEl.className = '';
     statusEl.textContent = 'Loading…';
     yearsEl.innerHTML = '';
+    reportEl.innerHTML = '';
 
     try {
       const [overviewRes, tags] = await Promise.all([
@@ -254,11 +395,18 @@
       const today = todayStr();
       const startYear = Number(overviewRes.rangeStart.slice(0, 4));
       const endYear = Number(overviewRes.rangeEnd.slice(0, 4));
+      const colorLabels = buildColorLabels(tags);
+
       let html = '';
+      let totalsHtml = '';
       for (let y = startYear; y <= endYear; y++) {
-        html += renderYear(y, overviewRes.days, today);
+        const { total, months } = yearCategoryTotals(y, overviewRes.days);
+        html += renderYear(y, overviewRes.days, today, months, colorLabels);
+        totalsHtml += renderYearTotal(y, total, colorLabels);
       }
       yearsEl.innerHTML = html;
+      reportEl.innerHTML = `<div class="year-totals">${totalsHtml}</div>`;
+
       statusEl.textContent = '';
     } catch (err) {
       statusEl.className = 'error';

tags.json

@@ -5,5 +5,6 @@
   "💼": { "label": "Work", "color": "gray" },
   "🦊": { "label": "Abunai!", "color": "orange" },
   "⛏️": { "label": "Xam", "color": "red" },
-  "🎲": { "label": "DND", "color": "yellow" }
+  "🎲": { "label": "DND", "color": "yellow" },
+  "💬": { "label": "Social", "color": "white" }
 }

test_days.js

@@ -57,6 +57,41 @@ DTSTART;VALUE=DATE:20260122
 DTEND;VALUE=DATE:20260123
 SUMMARY:✈️ 💜 Madeira
 END:VEVENT
+BEGIN:VEVENT
+UID:overlap-a@test
+DTSTAMP:20260101T000000Z
+DTSTART;TZID=UTC:20260109T090000
+DTEND;TZID=UTC:20260109T100000
+SUMMARY:✈️ Overlap A
+END:VEVENT
+BEGIN:VEVENT
+UID:overlap-b@test
+DTSTAMP:20260101T000000Z
+DTSTART;TZID=UTC:20260109T093000
+DTEND;TZID=UTC:20260109T110000
+SUMMARY:💜 Overlap B
+END:VEVENT
+BEGIN:VEVENT
+UID:overlap-resolved-a@test
+DTSTAMP:20260101T000000Z
+DTSTART;TZID=UTC:20260113T090000
+DTEND;TZID=UTC:20260113T100000
+SUMMARY:✈️ Overlap C nc
+END:VEVENT
+BEGIN:VEVENT
+UID:quickadd-1@test
+DTSTAMP:20260101T000000Z
+DTSTART:20260116T070000Z
+DTEND:20260116T080000Z
+SUMMARY:Quick add
+END:VEVENT
+BEGIN:VEVENT
+UID:overlap-resolved-b@test
+DTSTAMP:20260101T000000Z
+DTSTART;TZID=UTC:20260113T093000
+DTEND;TZID=UTC:20260113T110000
+SUMMARY:💜 Overlap D
+END:VEVENT
 END:VCALENDAR
 `;
 
@@ -69,7 +104,7 @@ const overview = buildOverview(ICS, tagsConfig, '2026-01-01', '2026-01-31');
 
 // plain weekly recurrence: morning segment, untagged -> muted
 assert.deepEqual(overview['2026-01-05'].segments, ['muted', null, null]);
-assert.match(overview['2026-01-05'].tooltip, /09:00 Standup/);
+assert.match(overview['2026-01-05'].tooltip, /10:00 Standup/);
 
 // EXDATE removes this occurrence entirely (nothing else touches this day)
 assert.equal(overview['2026-01-19'], undefined);
@@ -79,7 +114,7 @@ assert.equal(overview['2026-01-26'], undefined);
 
 // ...to Jan 27, 14:00 -> afternoon segment
 assert.deepEqual(overview['2026-01-27'].segments, [null, 'muted', null]);
-assert.match(overview['2026-01-27'].tooltip, /14:00 Standup \(moved\)/);
+assert.match(overview['2026-01-27'].tooltip, /15:00 Standup \(moved\)/);
 
 // all-day multi-day event with a known leading emoji lights every segment, both spanned days
 assert.deepEqual(overview['2026-01-10'].segments, ['magenta', 'magenta', 'magenta']);
@@ -91,15 +126,15 @@ assert.deepEqual(overview['2026-01-12'].segments, ['muted', null, null]);
 
 // leading emoji that IS in tagsConfig takes that entry's color, not re-prefixed in tooltip
 assert.deepEqual(overview['2026-01-06'].segments, ['aqua', null, null]);
-assert.equal(overview['2026-01-06'].tooltip, '10:00 ✈️ Flight to Spain');
+assert.equal(overview['2026-01-06'].tooltip, '11:00 ✈️ Flight to Spain');
 
 // leading emoji NOT in tagsConfig still stands out (not muted) via the fallback color
 assert.deepEqual(overview['2026-01-08'].segments, [null, null, 'blue']);
-assert.equal(overview['2026-01-08'].tooltip, '20:00 🎉 Party');
+assert.equal(overview['2026-01-08'].tooltip, '21:00 🎉 Party');
 
 // two consecutive leading emoji (no space between) split the segment into both colors
 assert.deepEqual(overview['2026-01-15'].segments, [['aqua', 'magenta'], null, null]);
-assert.equal(overview['2026-01-15'].tooltip, '09:00 ✈️💜 Trip with Tessa');
+assert.equal(overview['2026-01-15'].tooltip, '10:00 ✈️💜 Trip with Tessa');
 // single-emoji case (Jan 6, asserted above) still resolves to a plain string, not an array —
 // the split path only triggers for a genuine two-emoji run.
 assert.equal(Array.isArray(overview['2026-01-06'].segments[0]), false);
@@ -108,4 +143,18 @@ assert.equal(Array.isArray(overview['2026-01-06'].segments[0]), false);
 assert.deepEqual(overview['2026-01-22'].segments, [['aqua', 'magenta'], ['aqua', 'magenta'], ['aqua', 'magenta']]);
 assert.equal(overview['2026-01-22'].tooltip, 'All day ✈️ 💜 Madeira');
 
+// two tagged events overlapping in time -> conflict flagged on their shared day
+assert.equal(overview['2026-01-09'].conflict, true);
+// a day with only one tagged event -> no conflict
+assert.equal(overview['2026-01-06'].conflict, false);
+// untagged (muted) events don't count as a conflict even when they overlap
+assert.equal(overview['2026-01-05'].conflict, false);
+
+// "nc" as a standalone word in the title marks that event's conflict as resolved
+assert.equal(overview['2026-01-13'].conflict, false);
+
+// bare Z-suffixed timestamp (no TZID, how Google's quick-add events are exported) is an
+// absolute instant too -> displayed in Amsterdam local time (08:00 CET), not raw UTC (07:00)
+assert.equal(overview['2026-01-16'].tooltip, '08:00 Quick add');
+
 console.log('all assertions passed');