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Document problems with other strptime implementations.
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@ -1762,7 +1762,14 @@ A literal @samp{%} character.
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All other characters in the format string must have a matching character
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in the input string. Exceptions are white spaces in the input string
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which can match zero or more white space characters in the format string.
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which can match zero or more whitespace characters in the format string.
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@strong{Portability Note:} The XPG standard advises applications to use
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at least one whitespace character (as specified by @code{isspace}) or
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other non-alphanumeric characters between any two conversion
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specifications. The @w{GNU C Library} does not have this limitation but
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other libraries might have trouble parsing formats like
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@code{"%d%m%Y%H%M%S"}.
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The @code{strptime} function processes the input string from right to
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left. Each of the three possible input elements (white space, literal,
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