Date and time formats (GH #105, update #1195) Two pages plus a sidebar entry: Date-and-Time-Formats.md Light-touch user page. Where the install-wide setting lives (System > Date and time formats), where the per-analyst override lives (Preferences > General, beneath Timezone), and the distinction between the timezone and the format - which are easy to run together and answer different questions. Date-and-Time-Formats-Developer-Guide.md Code-first. The PHP and JavaScript formatter families side by side with worked examples, the UTC-instant vs naive wall-clock distinction, display vs machine formats, the token templates for bespoke shapes, how to wire up a page, and the greps that catch a regression. Includes the what-NOT-to-write examples, since the original bug was 67 copies of one wrong line.