|Files and file uploads: $wgThumbnailEpoch|
|If rendered thumbnail files are older than this timestamp, they will be re-rendered on demand as if the file didn't already exist.
|Introduced in version:||1.6.0 (r11945)|
|Removed in version:||still in use|
|Allowed values:||timestamp (string)|
|Other settings: Alphabetical | By function|
If rendered thumbnail files are older than this timestamp, they will be re-rendered on demand as if the file didn't already exist. 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
$wgThumbnailEpoch = 20210512030552;
If you are using a Unix-like system you can get the current date by entering the following on the command-line: