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Changes
→Cue Timestamp Rules
* one U+003A COLON character (:) only if the hour is zero and not included, if not, two U+003A COLON character (:).
3. Optionally (required if hour is non-zero) include
* Hour - two one or more characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9)
4. Should include
* Minute - 2 characters in the range of U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9). Range 00 to 59.
