USEFUL FIRST
One page, one complete task
A tool page should be worth visiting even before search engines exist. The working interface appears before the long explanation, results are readable without an account, and every related link serves a genuine next step. We do not publish empty result pages or create thousands of keyword variations that perform the same job.
METHODS SHOWN
Traditional systems need boundaries
Chinese calendar labels can change depending on whether a method uses Lunar New Year, Li Chun, solar terms, birth time, or location. Rather than hiding those choices, our tools identify the rule being used and display alternative year boundaries when they produce different answers.
PRIVATE BY DEFAULT
Keep simple inputs in the browser
These first tools calculate locally. The selected date is not uploaded or stored. Future tools that genuinely require a server will state what is sent, why it is needed, and when it is deleted next to the input itself—not only inside a distant privacy policy.