Don't mishandle year-9999 dates.
* lisp/calendar/parse-time.el (parse-time-rules): Allow years up to most-positive-fixnum. * lisp/calendar/time-date.el (date-to-time): Pass "Specified time is not representable" errors through. * lisp/url/url-cookie.el (url-cookie-expired-p): Treat out-of-range expiration dates as if they were far in the future. * src/editfns.c (decode_time_components): Store an invalid timespec on overflow, instead of returning false, so that the caller can distinguish overflow from other errors. (lisp_time_argument, lisp_seconds_argument): If the time is out of range, signal a time overflow instead of an invalid time spec. * src/keyboard.c (decode_timer): Treat time overflow like other timespec errors. Fixes: debbugs:18176
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