Inputs
Adding months/years can be tricky (Feb 29, end-of-month). This tool uses a predictable rule: clamp to the last day of the target month if needed.
Results
Fill inputs, then click Calculate.
Adding months/years can be tricky (Feb 29, end-of-month). This tool uses a predictable rule: clamp to the last day of the target month if needed.
Date add/subtract calculator — Add or subtract days/weeks/months/years from a date. Optional business-day mode (skip weekends + custom holidays). Shareable, browser-only MVP.
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.
日期加減計算器 — 日期＋/－ N 天/週/月/年；可選工作日模式（略過週末＋自訂假日）。可分享連結、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。