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Countdown timer & days matter for birthdays, holidays, exams, anniversaries & flash sales, with calendar, lunar dates & reminders. 一、一句话介绍 DateTimer 是一款 Chrome 浏览器扩展：把「值得等待的时刻」钉在浏览器一角——倒数日、倒计时、农历月历、节假日班休，点一下图标，抬眼即见。 二、产品概览 · 形态：Chrome / Edge 扩展，点击工具栏图标弹出，也可固定到浏览器侧边栏常驻 · 开箱即用：首次安装自带示例倒计时（发薪日、租金日、已发布），空状态提供发薪日、周末、下个假期快速添加模板 · 数据自主：全部数据保存在浏览器本地与 Chrome 同步空间，不依赖账号与服务器，无埋点无追踪；登录同一 Chrome 账号即跨设备自动同步 · 离线优先：核心功能完全离线可用；节假日数据内置，远端配置仅作增量刷新、不可达时自动降级 · 版本：v2.1.0，113 项单元测试护航 三、核心能力 1. 倒计时——为每一个 deadline 而生 · 一次性倒计时：自定义颜色、多种显示格式，可挂直达链接（抢购、秒杀场景） · 周期倒计时：发薪日、租金日、每周例会，到期自动滚动到下一期，永不过期 · 置顶大字模式：任意一项可置顶，弹出页顶部大字号常驻倒数 · 提前提醒：分钟级、天级提前量按项配置，系统通知不依赖页面打开 · 通知即达：点通知直达该项并高亮定位；带链接的通知附「打开链接」按钮且常驻不消失 · 跨时区：每项可独立指定时区，海外发布、异地抢购准点提醒 · 工具栏徽章：图标徽章实时倒数最近一项，最后 1 小时逐秒跳秒，不开弹窗也能瞄一眼 2. 倒数日（正数日）——记录「在一起的第 N 天」 · 从起算日正向累计：「在一起 930 天」「入职 2 年 7 个月」「妈妈 56 岁」 · 智能换算：自动组合年、月、天，长跨度不再数几百天 · 胶囊单位：N / 第 N 天·周·月·年、N 岁，或写「在一起」「已发布」等语义单位，编辑时实时预览 · 周年提醒：每年纪念日提前通知，默认开启，生日、纪念日不再错过 · 农历支持：按农历日期建立、每年农历周期重复，传统生日准点提醒 3. 农历月历——一屏看全时间 · 自研月历：农历、休/班徽标、节假日 emoji、下一个假期倒数 · 点击日期：当日信息、当日已有倒计时、一键创建该日倒计时 · 年月快选面板，月历标题点击即达 · 内置多年（2017–2026）节假日与调休班休数据，离线可用 4. 数据安心 · 备份与恢复：一键导出、导入 JSON，换机搬家不丢数据 · 自动快照：导入、清空、恢复操作前自动留档，误操作可回滚 · 跨设备同步：倒计时列表、主题、语言自动跟随 Chrome 账号 · 导入校验：损坏或伪造的备份文件会被安全拒绝，不污染现有数据 5. 体验细节 · 明暗双主题：跟随系统、手动切换，切换无闪屏 · 中英双语：跟随系统语言，一键切换 · 形态收放：日历与列表可分别收起，最紧凑只留一行时钟 · 分享卡片：任意倒计时一键生成分享图 · 到期顺延：已结束条目 +1 天、+1 周复活，清空已结束可撤销 · 顶部时钟点击即复制当前时间；下雪特效彩蛋 四、适用场景 · 抢购秒杀：倒计时 + 通知直达链接，最后 1 小时徽章逐秒倒数 · 职场节奏：发薪日、租金日、周会、版本日周期滚动，提前提醒 · 生活纪念：生日（含农历）、恋爱纪念日、宝宝出生第 N 天、年龄自动 +1 · 假期规划：下一个假期倒数，节假日、班休一目了然 · 项目管理：deadline 置顶大字常驻，跨时区协作准点提醒 五、技术与品质 · Chrome 扩展 Manifest V3：Service Worker 调度通知与徽章，休眠唤醒不漏报，休眠期间到期唤醒后自动补发 · 113 项单元测试覆盖核心逻辑 · 隐私承诺：数据仅在浏览器本地与 Chrome 同步空间，除可选的节假日、公告配置刷新外零外部请求 ════════════════════════════════════════ DateTimer Showcase (Plain Text) 1. One-liner DateTimer is a Chrome extension that pins "the moments worth waiting for" to a corner of your browser — days-matter counters, countdowns, a lunar calendar, and holiday & workday badges, one click away. 2. Product Overview · Form factor: Chrome / Edge extension. Click the toolbar icon for the popup, or dock it in the browser Side Panel · Works out of the box: ships with sample timers (payday, rent day, shipped), plus quick-add templates (payday, weekend, next holiday) in the empty state · Your data stays yours: everything lives in browser-local storage and Chrome sync. No accounts, no servers, no tracking. Sign into the same Chrome profile and your timers follow you across devices · Offline-first: core features work fully offline; holiday data is built in, with an optional remote refresh that degrades gracefully when unreachable · Version: v2.1.0, backed by 113 unit tests 3. Core Capabilities (1) Countdowns — built for every deadline · One-off timers with custom colors and multiple display formats; optional deep links for flash sales · Recurring timers — payday, rent, weekly standups — auto-roll to the next occurrence and never expire · Pin mode: pin any timer and it lives large at the top of the popup · Pre-reminders per item (minute- or day-level), delivered as system notifications even when the popup is closed · Click a notification to jump straight to the item with a highlight pulse; link notifications carry an "Open link" button and stay until handled · Per-item time zones — overseas launches and cross-region flash sales fire on time · Toolbar badge counts down the nearest timer, ticking per-second in the final hour — a glance without opening anything (2) Days Matter — "Day 930 together" · Counts up from a start date: "930 days together", "2 years 7 months in", "Mom turns 56" · Smart units combine years, months and days automatically — no more counting hundreds of days · Pill units: N / Day-N in weeks, months or years, "N yrs old", or your own words ("together", "shipped") with live preview while editing · Anniversary reminders on by default — birthdays and anniversaries never slip by · Lunar support: start on a lunar date and recur every lunar year, so traditional birthdays land on time (3) Lunar Calendar — the whole picture at a glance · Hand-built month grid: lunar dates, rest/work badges, holiday emoji, and a next-holiday countdown · Tap a day: details, existing timers, and one-tap creation of a countdown for that day · Fast year/month picker behind the calendar title · Built-in holiday and make-up-workday data (2017–2026), fully offline (4) Data You Can Trust · One-click JSON export and import — move machines without losing anything · Auto-snapshots before every import, clear and restore — mistakes are rollback-able · Cross-device sync of timers, theme and language via Chrome sync · Hardened import: corrupt or tampered backup files are safely rejected (5) Craft Details · Light & dark themes (auto + manual), bilingual ZH/EN, no-flash theme switching · Collapsible layout: calendar and list fold away; the most compact mode is a single clock line · Share cards: turn any timer into an image in one click · Postpone ended items by +1 day or +1 week; clearing ended items is undoable · Click the clock to copy the current time; a snow easter egg 4. Use Cases · Flash sales: countdown + notification deep link, badge ticking per-second in the final hour · Work rhythm: payday, rent, standups and release days on auto-roll with pre-reminders · Life milestones: birthdays (lunar too), anniversaries, baby day-counters, auto-incrementing age · Holiday planning: next-holiday countdown; holidays and make-up workdays at a glance · Project management: pin the deadline, per-item time zones for distributed teams 5. Engineering & Quality · Manifest V3 service worker schedules notifications and the badge; events missed while asleep are caught up on wake · 113 unit tests covering core logic · Privacy: data lives only in browser-local storage and Chrome sync; zero external requests beyond the optional holiday and announcement config refresh