Timezone overlap planner
Pick a date and timezones, then find the best overlap window for everyone.

1) Input

Participants
Each person has a timezone and a local availability window.
Saved locally (no account)

Notes: This is a best-effort planner. Daylight saving time and midnight-crossing windows are handled, but always double-check before sending invites.

2) Result

Fill the fields above, then click Find overlap.
About / 關於

Timezone overlap planner — Pick a date and 2–6 timezones, set each person’s availability window, and find the best overlap time. DST-aware and shareable.

Example: Use this tool to sanity-check numbers quickly, then share the link if you need to discuss with others.

FAQ: (1) Does it upload my data? No—runs in your browser. (2) Can I share results? Yes—use the share link feature. (3) Is it authoritative? Treat it as a convenience, not professional advice.

時區重疊時間規劃器 — 選日期與 2–6 個時區，設定每個人的可用時段，快速找出大家都方便的重疊時間（含夏令時間、可分享）。

範例：用這個工具快速試算與對照結果，需要討論時再把連結分享給對方。

FAQ： (1) 會上傳資料嗎？不會，計算在瀏覽器內完成。 (2) 能分享結果嗎？可以，用分享連結。 (3) 準確嗎？請把它當作便利工具，不是專業建議。