Check whether a date, time or datetime is valid.
A date object
A time object
A datetime object
True if the argument is valid.
A date is valid if its month number is in the range 1-12 and its day
number is in the range 1-31 and is compatible with its month number
(for instance 2006-2-29 is not a valid date). A time is valid if it
is positive and smaller than an entire day. A datetime is valid
if both its date part and its time part are valid.
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