Range checking and miscellaneous fixes tin time library #4466
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This primarily adds range-checking that was requested in #2350. This is done using a helper function match_digits_in_range.
%u takes a day of the week in the range of 1-7. However it was previously treated identically to %w that takes a value in the range 0-6. Similarly, %y takes only a two-digit year and thereby subtracting 1900 from it is wrong. This is also fixed.
Further, I have also fixed the error messages in a few places where it was wrong.