Cron 使用五个字段来描述 Linux 命令何时运行。本生成器可将常见的重复周期选项转换为可直接复制的表达式。
1700000000 是什么时候？为什么有些系统用 13 位数字？为什么时间恰好差了 8 个小时？弄懂几个概念，大部分时间相关的 bug 就会消失。
Unix 时间戳(Unix 时间、纪元时间)是一个整数，表示自 1970 年 1 月 1 日 00:00:00 UTC(即 Unix 纪元)以来经过的秒数。0 是 1970-01-01 00:00:00 UTC，1700000000 是 2023-11-14 22:13:20 UTC。
0 → 1970-01-01 00:00:00 UTC
1700000000 → 2023-11-14 22:13:20 UTC
1735689600 → 2025-01-01 00:00:00 UTC
2147483647 → 2038-01-19 03:14:07 UTC什么是 Unix 时间戳、如何区分 10 位和 13 位数值、UTC 与本地时间的换算、夏令时陷阱以及 2038 年问题。阅读指南 →
想要自己的版本？把下面的任务提示词粘贴到 AI 聊天中，或将技能文件保存到 AI 编程助手。其中包含我们开发此工具时整理的功能、边界情况和测试用例。
提示词和技能以英文提供，AI 工具在任何语言环境下都能很好地理解。
直接粘贴到 Claude、ChatGPT、Gemini 等 AI 聊天中即可。
You are an experienced full-stack web developer. Build a web tool called "Cron 表达式生成器" that meets the requirements below.
## Goal
Build a tool that creates and explains standard five-field cron expressions from a chosen schedule.
## Core features
- Schedule picker (every N minutes, hourly, daily, weekly, monthly)
- Plain-language description of the expression
- Preview of the next five run times
- Time zone selection (UTC, Asia/Seoul, …)
- Parse an expression typed by the user
## Inputs
- Schedule type and minute/hour/weekday/day values
- Time zone
## Outputs
- Cron expression
- Description
- Next run times
## Edge cases and handling rules
- Warn that setting both day fields means OR
- Explain steps that do not divide evenly, such as */45
- Validate out-of-range values like minute 60
- Explain run-time differences on UTC servers
## Implementation requirements
- Build it as a single page (HTML, CSS, JavaScript) that runs entirely in the browser, and never send the user's input to a server.
- Make the UI responsive and easy to use on mobile; label every input and keep everything keyboard accessible.
- Add a Copy button for results and show clear, friendly error messages for invalid input.
- Keep the core logic in functions separate from the UI so it can be unit-tested.
## Definition of done (test cases)
- Daily at 02:00 gives '0 2 * * *'
- Weekdays at 09:30 give '30 9 * * 1-5'
- '*/15 * * * *' runs every 15 minutes
First outline your implementation plan in at most five lines, then write the complete code, and finally explain how to check the test cases above.在 Claude Code 等 AI 编程助手中保存为 .claude/skills/build-cron-generator/SKILL.md，以后开发或修改此工具时可重复使用。
---
name: build-cron-generator
description: Use when building or changing a Cron 表达式生成器 tool. Build a tool that creates and explains standard five-field cron expressions from a chosen schedule.
---
# Build: Cron 表达式生成器
## Goal
Build a tool that creates and explains standard five-field cron expressions from a chosen schedule.
## Workflow
1. Review the required features, inputs and outputs below and ask about anything missing first.
2. Implement the core logic as pure functions separate from the UI.
3. Check the logic against the test cases in the verification list.
4. Build a responsive UI with an input form, a result area and a Copy button.
5. Reproduce each edge case listed under Rules and refine the error messages.
## Core features
- Schedule picker (every N minutes, hourly, daily, weekly, monthly)
- Plain-language description of the expression
- Preview of the next five run times
- Time zone selection (UTC, Asia/Seoul, …)
- Parse an expression typed by the user
## Inputs
- Schedule type and minute/hour/weekday/day values
- Time zone
## Outputs
- Cron expression
- Description
- Next run times
## Rules
- Warn that setting both day fields means OR
- Explain steps that do not divide evenly, such as */45
- Validate out-of-range values like minute 60
- Explain run-time differences on UTC servers
- Build it as a single page (HTML, CSS, JavaScript) that runs entirely in the browser, and never send the user's input to a server.
## Verification
- [ ] Daily at 02:00 gives '0 2 * * *'
- [ ] Weekdays at 09:30 give '30 9 * * 1-5'
- [ ] '*/15 * * * *' runs every 15 minutes