Without knowing the date it is not possible to tell whether 23:59:60 is a legal time of day... or, in theory, 23:59:59
It's still impossible even if you do know the date, if the date is >~6 months in the future
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And that's assuming your leap second lookup table is up to date
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"How can I tell if something is 'up to date', I don't even know what dates are anymore"
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