Fix overzealous code deletion

Signed-off-by: Travis Ralston <travpc@gmail.com>

src/DateUtils.js

@@ -55,6 +55,7 @@ function twelveHourTime(date) {
     let hours = date.getHours() % 12;
     const minutes = pad(date.getMinutes());
     const ampm = date.getHours() >= 12 ? 'PM' : 'AM';
+    hours = hours ? hours : 12; // convert 0 -> 12
     return `${hours}:${minutes}${ampm}`;
 }