fix date off by one

app/utils/dates.ts

@@ -0,0 +1,16 @@
+const YMD = /^(\d{4})-(\d{2})-(\d{2})/;
+const HAS_TZ = /(?:Z|[+-]\d{2}:?\d{2})$/i;
+
+export function formatContentDate(value: string, month: 'short' | 'long' = 'short') {
+    const match = YMD.exec(value);
+    if (!match) return '';
+    return new Date(Date.UTC(+match[1], +match[2] - 1, +match[3], 12)).toLocaleDateString(
+        'en-US',
+        { month, day: 'numeric', year: 'numeric', timeZone: 'UTC' },
+    );
+}
+
+export function contentDateAttr(value: string) {
+    if (HAS_TZ.test(value)) return new Date(value).toISOString();
+    return YMD.exec(value)?.[0] ?? '';
+}