fix: display meeting times from ISO offset string, not browser timezone

dashboard.html

@@ -349,31 +349,53 @@
                 return "green";
             }
 
+            // Parse the wall-clock date/time directly from an ISO-8601 string that
+            // already carries an offset (e.g. "2026-03-31T10:00:00-03:00").
+            // We never let the browser re-interpret it into its own timezone.
+            function parseISOParts(dateTimeStr) {
+                // Matches: YYYY-MM-DDTHH:MM:SS(±HH:MM or Z)
+                const m = dateTimeStr.match(
+                    /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2})(?::\d{2})?/,
+                );
+                if (!m) return null;
+                return {
+                    year: parseInt(m[1], 10),
+                    month: parseInt(m[2], 10),
+                    day: parseInt(m[3], 10),
+                    hour: parseInt(m[4], 10),
+                    minute: parseInt(m[5], 10),
+                };
+            }
+
             function formatLocalTime(dateTimeStr) {
-                const d = new Date(dateTimeStr);
-                return d.toLocaleTimeString([], {
-                    hour: "2-digit",
-                    minute: "2-digit",
-                    hour12: false,
-                });
+                const p = parseISOParts(dateTimeStr);
+                if (!p) return "";
+                const h = String(p.hour).padStart(2, "0");
+                const m = String(p.minute).padStart(2, "0");
+                return `${h}:${m}`;
             }
 
             function formatLocalDate(dateTimeStr) {
-                const d = new Date(dateTimeStr);
+                const p = parseISOParts(dateTimeStr);
+                if (!p) return "";
+                // Build a UTC date just for the locale label so day/month names are correct
+                const d = new Date(Date.UTC(p.year, p.month - 1, p.day));
                 return d.toLocaleDateString([], {
                     weekday: "short",
                     month: "short",
                     day: "numeric",
+                    timeZone: "UTC",
                 });
             }
 
             function isToday(dateTimeStr) {
                 const now = new Date();
-                const d = new Date(dateTimeStr);
+                const p = parseISOParts(dateTimeStr);
+                if (!p) return false;
                 return (
-                    d.getFullYear() === now.getFullYear() &&
-                    d.getMonth() === now.getMonth() &&
-                    d.getDate() === now.getDate()
+                    p.year === now.getFullYear() &&
+                    p.month === now.getMonth() + 1 &&
+                    p.day === now.getDate()
                 );
             }