Issue #21325 has been updated by nobu (Nobuyoshi Nakada). `format` is an alias of `#sprinf` inherited from `Kernel`. We can't rename it. ---------------------------------------- Misc #21325: make ruby more middle-aged man friendly https://bugs.ruby-lang.org/issues/21325#change-113125 * Author: pynix (Pynix wang) * Status: Open ---------------------------------------- after 35, I lose all interests about programming. no linux, no vim, no iterm2, and no much much. when I want to format a ruby time to string. I will try `Time.now.format("yy-MM-dd")`, but I get `private method 'format' called for an instance of Time` ohh, I google `ruby time format`, then I get `strftime`, I know this is from c standard library. answer me, looking my eyes. why? baby why? why I have to use c style method with ruby in 2025. format is the first choose when we not familiar with `Time` class, so, `format` is private, so we can rename it to `_format`, and make `format` a copy of `strftime` and deprecate the old one, -- https://bugs.ruby-lang.org/