📦 交货周期与再订货点Lead Time & Reorder Point Calculator
两种模式：按下单日和收货日计算交货周期（日历日或工作日，跳过周六日），或按再订货点 = 日均需求 × 交货周期 + 安全库存计算何时补货。日期会严格校验（如 2026-02-30 无效）。本地处理。Two modes: lead time from the order and receive dates (calendar days or business days, skipping weekends), or the reorder point = daily demand × lead time + safety stock. Dates are validated strictly (2026-02-30 is rejected). Processed locally.
使用说明与常见问题How-to & FAQ
「交货周期与再订货点」是什么？What is the Lead Time & Reorder Point Calculator tool?
两种模式：按下单日和收货日计算交货周期（日历日或工作日，跳过周六日），或按再订货点 = 日均需求 × 交货周期 + 安全库存计算何时补货。日期会严格校验（如 2026-02-30 无效）。本地处理。Two modes: lead time from the order and receive dates (calendar days or business days, skipping weekends), or the reorder point = daily demand × lead time + safety stock. Dates are validated strictly (2026-02-30 is rejected). Processed locally.
如何使用「交货周期」？How do I use the Lead Time & Reorder Point Calculator tool?
选择下单日和收货日，即可得到交货期（天数）。结果会随输入实时更新。Pick the order date and the receive date to get the lead time in days. The result updates as you type.
交货周期怎么算？How is lead time counted?
日历日 = 收货日 − 下单日，例如 1 月 5 日下单、1 月 19 日收货是 14 天。勾选「只计工作日」时，只数下单次日到收货日（含）之间的周一至周五，同一例子是 10 个工作日；法定节假日不会自动扣除。Calendar days = receive date − order date; ordering on 5 January and receiving on 19 January is 14 days. With business days only, the page counts Monday to Friday from the day after the order up to and including the receive date, so the same example is 10 business days. Public holidays are not removed automatically.
再订货点是什么？What is the reorder point?
再订货点 = 日均需求 × 交货周期 + 安全库存。例如每天卖 20 件、交货要 14 天、安全库存 50 件，库存降到 330 件时就该下单。Reorder point = daily demand × lead time + safety stock. Selling 20 units a day with a 14-day lead time and 50 units of safety stock, you should reorder when stock falls to 330 units.
日期怎么校验？How are dates checked?
日期须为真实存在的日历日（YYYY-MM-DD），例如 2026-02-30 会被拒绝；收货日不能早于下单日。Dates must be real calendar dates (YYYY-MM-DD), so 2026-02-30 is rejected, and the receive date cannot be before the order date.
能举个计算实例吗？Can you show a worked example?
例如在「交货周期与再订货点」中填 模式 = 交货周期（两个日期之间），下单日 = 2026-01-01，收货日 = 2026-01-11，日均需求（件/天，再订货点模式） = 20，交货周期（天，再订货点模式） = 14，安全库存（件，可选） = 50，结果区显示：交货周期：10 天；日历日：10 天For example, entering Mode = Lead time (between two dates), Order date = 2026-01-01, Receive date = 2026-01-11, Daily demand (units/day, reorder point mode) = 20, Lead time (days, reorder point mode) = 14, Safety stock (units, optional) = 50 in the Lead Time & Reorder Point Calculator gives: Lead time: 10 days; Calendar days: 10 days
哪些输入会被检查？Which inputs are validated?
「交货周期与再订货点」会检查这些输入——「日均需求（件/天，再订货点模式）」：所选方式用到时必须填写，不能为负数；「交货周期（天，再订货点模式）」：所选方式用到时必须填写，不能为负数，须为整数；「安全库存（件，可选）」：可留空；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Lead Time & Reorder Point Calculator checks its inputs — "Daily demand (units/day, reorder point mode)": required when the chosen option uses it, cannot be negative; "Lead time (days, reorder point mode)": required when the chosen option uses it, cannot be negative, must be a whole number; "Safety stock (units, optional)": optional; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.
有哪些选项可以调整？What options can I adjust?
「交货周期与再订货点」的设置：「模式」可选 交货周期（两个日期之间）、再订货点（默认 交货周期（两个日期之间））；「下单日」默认 2026-01-05；「收货日」默认 2026-01-19；「日均需求（件/天，再订货点模式）」默认 20；「交货周期（天，再订货点模式）」默认 14；「安全库存（件，可选）」默认 50；可勾选：「只计工作日（跳过周六、周日）」。每次生成结果都按当前设置处理。Settings in the Lead Time & Reorder Point Calculator — "Mode": Lead time (between two dates), Reorder point (default Lead time (between two dates)); "Order date" default 2026-01-05; "Receive date" default 2026-01-19; "Daily demand (units/day, reorder point mode)" default 20; "Lead time (days, reorder point mode)" default 14; "Safety stock (units, optional)" default 50; tick boxes: "Business days only (skip Saturdays and Sundays)". The result always uses the current settings.
和时区有关吗？Do time zones matter?
无关。「交货周期与再订货点」只做时长或日期格式的换算，不读取设备时间，时区和夏令时不影响结果。No. The Lead Time & Reorder Point Calculator only converts durations or date formats and never reads the device clock, so time zones and daylight saving time do not affect the result.
「交货周期与再订货点」免费吗？需要注册吗？Is the Lead Time & Reorder Point Calculator free? Do I need an account?
「交货周期与再订货点」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Lead Time & Reorder Point Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.