Function iso_utc 

pub fn iso_utc(time: NaiveDateTime) -> String

Formats a UTC chrono::NaiveDateTime (how CorTeX stores every timestamp) as an RFC 3339 / ISO 8601 string with an explicit +00:00 offset, e.g. 2026-06-15T05:52:00+00:00. This is the machine-readable, zone-unambiguous form emitted in DTO time fields and <time datetime="…"> attributes: the browser ([public/js/localtime.js]) rewrites it to the viewer’s local time with the zone code (EST/EDT/…), and agents get a directly parseable timestamp. Replaces the old zone-ambiguous %Y-%m-%d %H:%M rendering, which silently displayed UTC as if it were local.