⏰ 递减时钟时间Decrement Clock Time
把每行时间减去若干秒（可批量，按日回绕）。本地处理。可设置「秒数」。Subtract seconds from each time (batch; wraps within a day). Processed locally. Settings: Seconds.
使用说明与常见问题How-to & FAQ
「递减时钟时间」是什么？What is the Decrement Clock Time tool?
把每行时间减去若干秒（可批量，按日回绕）。本地处理。可设置「秒数」。Subtract seconds from each time (batch; wraps within a day). Processed locally. Settings: Seconds.
如何使用「递减时钟时间」？How do I use the Decrement Clock Time tool?
每行输入一个 HH:MM 或 HH:MM:SS 时间，填写要减去的秒数，下方即显示结果。Enter one HH:MM or HH:MM:SS time per line and the number of seconds to subtract; the results appear below.
跨过午夜会怎样？What happens across midnight?
按 24 小时回绕，例如 00:00:30 减 60 秒 = 23:59:30，不显示前一天。Times wrap within 24 hours, so 00:00:30 minus 60 seconds is 23:59:30; the previous day is not shown.
输入格式有错时会怎样？What happens if a line is invalid?
会报出是第几行，例如“第 2 行：时间无效”。The error names the line, for example "Line 2: Invalid time".
和时区有关吗？Do time zones matter?
无关，这里只对钟面时间做减法，不读取设备时钟，也不考虑夏令时。No. It only subtracts from clock readings, never reads your device clock and ignores daylight saving time.
输入和输出是什么样的？What does the input and output look like?
例如把「秒数」设为 60，输入 12:00:00，输出为：11:59:00。With "Seconds" set to 60, the input 12:00:00 becomes 11:59:00.
有哪些选项可以调整？What options can I adjust?
「递减时钟时间」的设置：「秒数」默认 60。每次生成结果都按当前设置处理。Settings in the Decrement Clock Time tool — "Seconds" default 60. The result always uses the current settings.
「递减时钟时间」免费吗？需要注册吗？Is the Decrement Clock Time tool free? Do I need an account?
「递减时钟时间」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 Decrement Clock Time tool is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.