Lets face it, the vast majority of daily events start on the minute or on the hour, but not on the second. Since TOML supports 'time of day' then this should really be made more pragmatic and allow the format that pretty much everyone uses for daily events which is HH:MM like:
'09:30' '14:00'
as opposed to
'09:30:00' and '14:00:00'

Obviously the latter HH:MM:SS and HH.MM.SS.F should continue to be supported, but I am essentially asking for HH:MM to be added as a valid time-of-day format.
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EDIT: To keep it simple I am hereby paring down my request to just making the seconds optional (default to :00) in the 'time-of-day' format, since that would already be a big step forward, and I think most would agree that this is a step in the right direction.
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One debatable point is whether '9:30' should also be allowed in addition to '09:30'. I don't see why not. Maybe in future even '9am' and '2pm'. As a human readeable configuration format why would TOML not allow time to be written the way most people actually write it? This wouldn't introduce any ambiguity and updating the parsers would be straight forward too.

Thank you for your consideration!

BTW: I love TOML! Its a great idea! In the past I rolled my own parsers for .ini style files but now this is one less thing I need to worry about :-) Great Job!