Manual:$wgThumbnailEpoch/zh

细节
如果渲染的缩略图文件早于此时间戳，则会根据需要重新渲染它们，就像该文件不存在一样. Update if there is some need to force thumbs and SVG rasterizations to re-render, such as fixes to rendering bugs.

For a quick copy-paste you can use the following line, which was generated using :

If you are using a Unix-like system you can get the current date by entering the following on the command-line: