「把空闲时段变成可粘贴的文字」这件事，已经有免费工具做了——代价是把 Google 日历只读授权给它。**这个工具不要授权、也不连日历**，它服务两类人：公司账号不让授权、或者用 Outlook 的；以及真正会出错的那类场景——**跨时区**。 把你这几天**忙的**时段贴进来（`2026-08-03 14:00-16:00`、`周二 09:30-11:00`、`8/5 全天` 都认），代码算出工作时间窗里剩下的空档，然后做三件人容易算错的事： **一、按真实时区数据换算**，不是按固定时差表——因为时差在夏令时期间会变； **二、标出跨日**：你的周三上午，在对方那边可能是周二晚上。**跨日是约错时间的第一大来源**——你说「周三」，对方记成他的周三，差了一整天； **三、标出夏令时切换**：如果这段日期跨了切换，那一周所有固定时差都是错的，工具已按每天的真实偏移逐段算过，并提醒你在邮件里写全两地时间。 还会把落在对方**半夜**的时段单独挑出来建议删掉——报一个对方凌晨 3 点的时间，比少报几个时段更伤印象。 输出是中英两版可直接粘贴的文本。$2 解锁三种语气的完整邀约邮件、可直接保存的 .ics 日历文件文本、以及对方改期时的回复模板。Turning free slots into pasteable text is already solved — by free tools that want read-only access to your Google Calendar. **This one asks for no access and connects to nothing.** It serves two groups: people whose work accounts forbid granting it (or who use Outlook), and the case where mistakes actually happen — **across time zones**. Paste the blocks you're **busy** (`2026-08-03 14:00-16:00`, `Tue 09:30-11:00`, `8/5 all day` all parse). The code computes what's left inside your working hours, then does the three things people get wrong: **One, convert using real timezone data** rather than a fixed offset — offsets move with daylight saving. **Two, flag day rollovers**: your Wednesday morning can be their Tuesday evening. **This is the single biggest source of missed meetings** — you say Wednesday, they write down their Wednesday, and you're a day apart. **Three, flag daylight-saving transitions**: if your range crosses one, every fixed offset is wrong that week. The conversion here already uses each day's true offset, and it tells you to spell out both zones in the email. It also separates out slots landing in **their middle of the night** — offering someone 3am costs you more than offering fewer slots. Output is pasteable text in English and Chinese. $2 unlocks three tones of full invitation email, a savable .ics calendar file, and reply templates for when they ask to move it.
三种语气的完整邀约邮件（正式对客户／半正式对同行／简短对熟人，中英双语）、可直接存成 .ics 的日历文件文本、对方说「都不合适」时的回复模板，以及跨时区约会议的六条通用规则。Full invitation emails in three registers (formal, peer, brief — English and Chinese), .ics calendar text you can save directly, replies for when none of the slots work, and six rules for scheduling across time zones.
本工具不连接、不读取、不存储任何日历——所有时段都来自你自己粘贴的文本。时区换算使用运行环境的 IANA 时区数据库并按每一天的真实偏移计算，但**夏令时规则会因各国政策变动而调整**，重要会议请在发出前以双方日历软件显示的时间复核一次。工作时间窗、最短时长、是否含周末都由你设定，工具不替你判断哪个时段「合适」。发出的时间以你和对方最终确认的为准；本工具不发送邮件、不创建日历事件、不提醒。你填写的内容不入库。This connects to, reads and stores no calendar — every block comes from text you paste. Conversion uses the runtime's IANA timezone database with each day's true offset, but **daylight-saving rules change by government policy**; for anything important, verify against both parties' calendar apps before sending. Working hours, minimum length and weekend inclusion are yours to set; the tool does not judge which slot is appropriate. What matters is what you and the other party confirm. This sends no email, creates no event and sets no reminder. Nothing you enter is stored.