We interpret the date/time you entered as a wall-clock time in the selected time zone (DST-aware), then count down to that exact moment.
Privacy: this tool runs entirely in your browser. Your inputs are stored only in localStorage (and optionally in the share link hash).
Countdown (time until a date-time) — Count down to a target date/time in a chosen time zone (DST-aware). Shows the exact target moment and a copyable summary. Shareable, browser-only.
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.
倒數計時（距離日期時間） — 選目標日期/時間與時區（含夏令時間），顯示精確目標時刻與剩餘時間，並可複製摘要/分享連結。純前端。
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。