Document time date placeholder transforms

src/player/regions/time-date.js

@@ -203,7 +203,7 @@ function getTimeDateFormattedParts(timeZone, date) {
     dddd: toTitleCase(getPart(weekdayLong, 'weekday')),
     MMM: toTitleCase(getPart(monthShort, 'month')),
     MMMM: toTitleCase(getPart(monthLong, 'month')),
-    a: toTitleCase(getPart(ampm, 'dayPeriod')),
+    a: String(getPart(ampm, 'dayPeriod') || '').toLowerCase(),
       tz: getPart(timezoneShort, 'timeZoneName'),
       tz_long: resolvedTimeZone,
     date: getPart(numericParts, 'year') + '-' + getPart(numericParts, 'month') + '-' + getPart(numericParts, 'day'),